Mashima HERO'S (Ｍａｓｈｉｍａ ＨＥＲＯ＇Ｓ Mashima Hīrōzu) is a Japanese manga series by Hiro Mashima and a spin-off to the manga series Fairy Tail.
Written and illustrated by Hiro Mashima, HERO'S is a spin-off manga mini-series that began serialization on October 16, 2019. The mini-series is a crossover between three of Mashima's manga series: Rave Master, Fairy Tail, and Edens Zero. In February 2020, Mashima announced that the manga would be rebranded as "Mashima HERO'S" to improve search engine results, and that he was considering a sequel to the story.
Team Natsu takes a tropical vacation on True Island, where the truth of the world sleeps. While exploring the jungle, Natsu gets into a fight over a fruit with a boy who uses Gravity Ether Gear, a strange power unlike any Magic Natsu has ever seen. Their battle is interrupted by the boy's friend, Rebecca, who reveals that there are plenty other fruits just like the one they've been bickering over. With their differences resolved, Natsu immediately befriends the boy, Shiki, and offers to help him find a friend named Homura, who went missing while looking for something on the island called "Oasis". Unbeknownst to them, their presence is found by one of the island's natives, Shinra, whose concerns for Oasis are dismissed by his elderly mentor, the Creator, who can turn things from his imagination into reality. Meanwhile, Haru and his friends are also on the island and intend to destroy Oasis.
October 16, 2019
2. Island (Ｉｓｌａｎｄ)
After Natsu and Shiki's groups marvel over the similarities between each other and the people they know, the two boys set out with Happy to investigate the island town in search of Homura, who recovers from a heatstroke to find herself imprisoned in a temple dungeon. While she puts up with the company of Wonderful Gocche and Ichiya, Haru's group infiltrates the temple to confront the Creator over Oasis, a Dark Bring that gives him his power over imagination; as a sign of goodwill, the Creator reveals all of his soldiers to be his creations and dispels them away. Upon Natsu and Shiki's arrival in town, Let and Julia—a duo with the scent of Dragons—overhear the two boys talking about Oasis and prepare to eliminate them, assuming them to be enemies.
October 23, 2019
3. Rebel (Ｒｅｂｅｌ)
Natsu and Shiki prove to be a match for Let and Julia and their Dragon Race techniques. Meanwhile, the Creator—Mashymre—heeds Haru's warning about Oasis's true nature, but as he ponders over the consequences that destroying the evil stone would have on the island, he is betrayed and stabbed by Shinra, who has fallen under the Dark Bring's influence and claims the stone for himself. Shinra proceeds to destroy the temple—freeing Homura and her prison mates in the process—and indulge in his twisted dreams by creating tentacles on the beach to erotically ensnare Natsu and Shiki's female friends. Desiring even more power and popularity, Shinra uses Oasis to assume a new form resembling Jellal, dubbing himself Genesis.
October 30, 2019
4. Oasis (Ｏａｓｉｓ)
While Natsu and Shiki's friends fend off the tentacles, the two boys form a truce with Let and Julia to defend the townspeople from Genesis's army of black monsters. Meanwhile, the heroes inside the temple find themselves cut off from each other as Genesis restructures the entire island into a castle. During the chaos, Haru and Plue get catapulted far away from the castle and crash headfirst into Natsu, with neither of the boys recognizing each other.
November 6, 2019
5. Mix (Ｍｉｘ)
Haru, Natsu, and Shiki's friends continue to battle against Genesis's creations, which continue to multiply without end. Meanwhile, the three heroes are gawking over their shared familiarity with Plue when Genesis appears before them, overhearing that Plue has the power to destroy his Dark Bring. The heroes join forces to battle Genesis, but Genesis's imaginative powers allow him to overpower the trio with little effort. With Natsu and Shiki defeated, Genesis prepares to kill Haru.
November 13, 2019
6. Attack (Ａｔｔａｃｋ)
Natsu and Shiki gain a second wind and attack Genesis, but Genesis dodges and lets their attacks collide with each other. While the three heroes argue among themselves, Genesis decides that he would rather kill them more creatively and retreats to his newly completed castle, Altairis. Unable to agree on their next course of action, the trio split up. As Genesis conjures more monsters in different places—including the Fairy Tail guildhall itself—to bring about the end of the world, the rest of the heroes encounter each other in splintered groups within Altairis and team up against the monsters; Gray and Musica in particular meet Shiki's friend Weisz, who builds a mechanical orb that he dubs their secret weapon, "HEROS".
November 20, 2019
7. Session (Ｓｅｓｓｉｏｎ)
Lucy, Rebecca, and Elie are nearly overwhelmed by the monsters and tentacles, but they are rescued by Natsu, Shiki, and Haru, who remain on sour terms with each other. Suddenly, all of their friends come together in the same room, reunited through the navigational system of Weisz's HEROS. Sensing the heroes' reunion, Genesis creates a legion of new, terrifying monsters against them. As the entire group convenes over a strategy, they are contacted by Shiki's crewmates, who reveal that the stone around Genesis's neck is actually channeling Oasis's power from another location on the island. Agreeing to work together again, the heroes set out to battle Genesis as a distraction while the rest of their friends seek out the real Oasis to destroy it.
November 27, 2019
8. Heroine's (Ｈｅｒｏｉｎｅ＇ｓ)
While their friends advance through hordes of monsters towards True Island's center, where the real Oasis is located, Haru, Natsu, and Shiki reach the top of Altairis for a rematch with Genesis. With their coordination improved, the three heroes manage to overcome Genesis's attacks. Meanwhile, the rest of the group holds off the monsters for Elie, Lucy, and Rebecca to reach the cave at the heart of the island. There, the three heroines encounter Mashymre, who has regained his true identity as the god of creation and the one who made Oasis, and prepares to reveal the truth of the island to them.
December 4, 2019
9. Illusion (Ｉｌｌｕｓｉｏｎ)
Mashymre explains that he is one of several creator gods who would draw illustrated stories from the temple of Maga, including the very adventures Haru, Natsu, and Shiki are on. Sixty years in the past, however, Mashymre became so obsessive in his work that he completely lost himself, creating True Island—the true form of Oasis—and all of its inhabitants as his power spiraled out of control. Using Plue, who just happened to be taken by the Jiggle Butt Gang, the heroines are able to combine their magic power with his to destroy Oasis's power, completely negating Genesis's power and allowing the three heroes to defeat him.
December 11, 2019
10. MAte (ＭＡｔｅ)
With Oasis's power gone, the island and everything on it disappears, leaving all of the heroes and Mashymre standing in a vast flowerfield. The heroes celebrate their victory and happily chat amongst themselves for a while until the field itself begins to disappear. Mashymre explains that he is returning to the land of the gods, which will cause everyone else to return to their respective worlds, so the heroes bid each other farewell, believing they will all meet again some day. Upon their return, however, they find that Mashymre has sent the Jiggle Butt Gang, Ichiya, and Mosco to the wrong worlds as a joke.
Natsu is a Fire Dragon Slayer and a member of Fairy Tail. He comes to True Island on vacation with his friends. After getting into a fight with Shiki over a fruit, the two quickly become friends and team up to find Homura, one of Shiki's missing friends.
Happy is Natsu's Exceed partner and a member of Fairy Tail. He comes to True Island on vacation with his friends. He is identical in nearly every way to a member of the Edens Zero crew, who is also named Happy.
Makarov is the Guild Master of Fairy Tail who defends the guildhall from Genesis's monsters.
Shiki Granbell シキ・グランベル Shiki Guranberu
Shiki is the Demon King of the Edens Zero and a space explorer who uses a Magic-like power called Gravity Ether Gear to control gravity. He comes to True Island to search for his missing friend Homura, and teams up with Natsu after fighting and later befriending him.
Rebecca レベッカ Rebekka
Rebecca is Shiki's best friend and a crew member of the Edens Zero. She accompanies Shiki in his search for Homura on True Island.
Pino ピーノ Pīno
Pino is an android and crew member of the Edens Zero. She accompanies Shiki in his search for Homura on True Island.
Weisz Steiner ワイズ・シュタイナー Waizu Shutainā
Weisz is a crew member of the Edens Zero with the ability to manipulate machinery with his Ether Gear, Machina Maker. He is dispatched to find Shiki's group after they lose contact during their search for Homura.
Homura Kôgetsu ホムラ・コウゲツ Homura Kōgetsu
Homura is a swordswoman and crew member of the Edens Zero who creates swords of solid Ether with her Ether Gear, Soul Blade. She is imprisoned on True Island while looking for Oasis for a place to train. She is noted for her slight resemblance to Kagura Mikazuchi, an acquaintance of Fairy Tail's.
Mosco モスコ Mosuko
Mosco is an obese android that serves aboard the Edens Zero.
Hermit ハーミット Hāmitto
Hermit is an android girl and one of the Demon King's Four Shining Stars who serve aboard the Edens Zero. She contracts Shiki and his friends from the ship.
Witch ウィッチ Witchi
Witch is an android woman and one of the Demon King's Four Shining Stars who serve aboard the Edens Zero. She contracts Shiki and his friends from the ship.
Sister シスター Shisutā
Sister is an android woman and one of the Demon King's Four Shining Stars who serve aboard the Edens Zero. She contracts Shiki and his friends from the ship.
Happy ハッピー Happī
Happy is an android cat and Rebecca's best friend who is capable of transforming into blasters. He is otherwise virtually identical to Fairy Tail's Happy.
Haru is the Rave Master, a boy who uses the power of Rave to destroy Dark Brings. He wields a sword called the Ten Commandments, which changes into different forms through Rave's power. Haru travels to True Island in search of the "Oasis" Dark Bring.
Plue is Haru's "dog" companion who aids him in his search for the Raves and Dark Brings. He accompanies Haru in his search for Oasis. He is identical to the Celestial Spirit of the same name, as well as a species of dog that runs a restaurant Shiki has patroned.
Let is a member of the Dragon Race with powers similar to Dragon Slayer Magic. He and Julia investigate True Island separately from their friends, leading them to battle Natsu and Shiki after a misunderstanding over Oasis.
Julia is a member of the Dragon Race with powers similar to Dragon Slayer Magic. She and Let investigate True Island separately from their friends, leading them to battle Natsu and Shiki after a misunderstanding over Oasis.
Shuda シュダ Shuda
Shuda is one of Haru's friends who is present in a town attacked by Genesis's monsters.
Belnika ベルニカ Berunika
Belnika is one of Haru's friends who is present in a town attacked by Genesis's monsters.
Cancer, "The Giant Crab", is a Gold KeyCelestial Spirit that takes the form of a humanoid crab and uses scissors for combat. His key is owned by Lucy Heartfilia.
Genesis ジェネシス Jeneshisu
Genesis is Shinra's alter ego, created from his imagination through the power of Oasis. He is identical in appearance to Jellal Fernandes and Haru's acquaintance Sieghart, and mimics Jellal's Heavenly Body Magic.
Mashymre マシュマー Mashumā
Mashymre is an old man also known as the Creator (想像主 Sōzōshu) who uses Oasis to entertain the people of True Island. Despite his use of a Dark Bring, he is unaffected by its evil influence. He is later revealed to be the God of Creation, as well as the creator of Oasis.
Shinra シンラ Shinra
Shinra is Mashymre's disciple, who is corrupted by Oasis in his mentor's place and betrays him to claim the stone for himself, using it to transform into Genesis.
Asuka is Alzack and Bisca's daughter who is present in the Fairy Tail guildhall when it is attacked by Genesis's monsters.
Dragon Slayer Magic (滅竜魔法 Metsuryū Mahō): A type of Magic that bestows its users with the attributes of Dragons, namely elemental powers and heightened senses such as smell and hearing. Those who practice this Magic, such as Natsu and Wendy, are known as Dragon Slayers (滅竜魔道士 Doragon Sureiyā).
Fire Dragon Slayer Magic (炎の滅竜魔法 Honō no Metsuryū Mahō): A form of Dragon Slayer Magic that allows its user, Natsu, to create and manipulate fire.
Fire Dragon's Roar (火竜の咆哮 Karyū no Hōkō): Natsu expels flames from his mouth, incinerating everything in their path.
Heart Kreuz Armor (ハートクロス鎧 Hāto Kurosu Yoroi): Erza's casual armor, which she is mostly seen wearing.
True Island (トゥルーアイランド Turū Airando): A tropical island where the truth of the world is rumored to be found. It is the true form of the Dark Bring Oasis, brought into existence when Mashymre's creative powers ran wild, and serves as a junction between Haru, Natsu, and Shiki's worlds. The island resembles the letter "M" from overhead.
Altairis (暗黒の楽園 Altearisu): A castle constructed by Genesis with Oasis's power from parts of True Island, also known as the "castle of imagination". It shares its name with a Heavenly Body Magicattack used by Jellal.
Magnolia Town (マグノリア Magunoria): The city where the Fairy Tail guildhall is located.
Maga (マガ Maga): A temple where gods of creation such as Mashymre convene to draw stories.
Sakura Cosmos (桜宇宙 Sakura Kosumosu): A sector of space in Shiki's world where he and his friends live.
Symphonia Continent (シンフォニア大陸 Shinfonia Tairiku): A continent that exists within Haru and his friends' world.
Song Continent (ソング大陸 Songu Tairiku): A continent in Haru and his friends' world, which has an open hot spring located in the south of the continent. This is the first stop of the Three Secret Hot Springs Tour. 
Spa of Eden (エデンの湯 Eden no Yu): An Ether-Activating bath that located within the spaceship Edens Zero. This is the second stop of the Three Secret Hot Spring Tours.
Balsam Village (鳳仙花村 Hōsenka Mura): A famous spa town in Fiore that located in the way West of Magnolia Town. This is the last stop of the Three Secret Hot Spring Tours. 
Ether Gear (エーテルギア Ēteru Gia): A technique that allows its user to reconfigure the flow of Ether in their body like a machine, giving them superhuman abilities. It is assumed by Natsu Dragneel to be some form of Magic, though this is denied by Shiki Granbell.
Gravity Ether Gear (重力のエーテルギア Jūryoku no Ēteru Gia): A form of Ether Gear that allows its user, Shiki, to alter the strength and direction of gravity for themselves and others. This includes the ability to walk on upside-down surfaces, float in midair, "fall" sideways to move at great speeds, and generate orbs of gravity that increase the weight and force of the user's attacks.
Magimech Attack: Gravity Fist (魔械流 重拳 Makai-ryū: Jūken): Shiki increases the weight of his fist and punches his opponent with incredible force.
Magimech Attack: Gravity Bullets (魔械流 重弾 Makai-ryū: Jūdan): Shiki creates bullets of condensed gravitational energy from his knuckles and fires them towards his opponent.
Magimech Attack: Gravity Center (魔械流 重心 Makai-ryū: Jūshin): Shiki increases his own weight to the point of shattering and breaking through the surface he stands on.
Gravity Comet (重彗星 Jūsuisei): Shiki falls with his arm outstretched towards his opponent like a comet, creating a gravity field around them.
Soul Blade: A form of Ether Gear used by Homura to create swords of solid Ether.
Machina Maker: A form of Ether Gear that allows its user, Weisz, to manipulate machinery.
B-Cube: A cubical video-recording device that Rebecca wears around her neck.
Edens Zero (エデンズ ゼロ Edenzu Zero): An interstellar warship that is used by the Crew of Edens to explore the cosmos. Its existence is kept a secret from the denizens of Earth Land, since the knowledge of space-travel would upend the planet's "primitive" culture.
Dark Bring (ダークブリング Dāku Buringu): An evil stone that gives its user special powers, but also steeps their heart in darkness, corrupting them. It is also capable of influencing people in the nearest vicinity if the user is not affected. It is Haru's duty as the Rave Master to travel the world and destroy Dark Brings wherever he can find them.
Oasis (オアシス Oashisu): This Dark Bring is a "fountain of dreams" that grants its holder the ability to turn anything from their imagination into reality, including people, creatures, and techniques. The actual form of the Dark Bring is True Island itself, and its power can be harnessed through a smaller stone. This stone used by Mashymre for benevolent purposes until it is stolen by his disciple, Shinra, who uses it to become Genesis.
Rave: A holy stone used by the Rave Master, Haru Glory, that harbors the power to destroy Dark Brings. It is embedded in Haru's sword, the Ten Commandments.
Ten Commandments: Haru's weapon, a sword that harnesses the power of Rave to assume different forms with their own unique powers.
Eisenmeteor: A large, iron sword that is capable of knocking multiple enemies away. It is the default form of Haru's sword.
Explosion (爆発の剣 Ekusupurōjon): A sword that creates powerful explosions on impact.
Explosive Dragon Combo: Dual Explosion (爆・竜連携 デュアルエクスプロージョン Baku Ryūrenkei: Dyuaru Ekusupurōjon): Haru splits Explosion into two swords and attacks his opponent with a massive blast.
Silfarion (音速の剣 Shirufarion): A sword that allows Haru to move and attack enemies at superhuman speed.
Blue Crimson (双竜の剣): A pair of swords split from the original that are cloaked in fire and ice, respectively.
Rune Save (封印の剣): A sword with the ability to cut through Magic, negating its effects.
Gravity Core (重力の剣): A sword capable of generating a powerful gravitational field.
Ravelt: Haru's ultimate sword, a holy blade that draws out the full power of Rave.
Tonfa Blasters (ガンズトンファー Ganzu Tonfā, lit. "Guns Tonfas"): A pair of tonfas used by Elie that fire magical bullets.
Silver Claiming: An alchemical technique that allows its user, Musica, to change the shape of silver objects.
Silver Ray (シルバーレイ Shirubā Rei): Musica transforms his silver necklace into a spear, allowing him to take down multiple enemies at once.
Dragon Race Arts: A set of Dragon-like techniques used by members of the Dragon Race such as Let and Julia. They are confused by Natsu to be some form of Dragon Slayer Magic.
Flame Dragon Drought (炎竜旱天 Enryū Kanten): Let expels flames from his mouth, incinerating everything in their path. It is identical to Fire Dragon's Roar in all but name and origin.
HEROS (ＨＥＲＯＳ Hīrōzu): A mechanical orb with a navigational system that helps others find their friends and acquaintances; its name is an anagram for "Helix Effect Radical Operation Searcher". It is constructed by Weisz to serve as a "secret weapon" against Genesis, and allows Haru, Natsu, and Shiki's allies to reunite within Altairis.
Dragon Force (ドラゴンフォース Doragon Fōsu): A transformation accessible to Dragon Slayers that changes their appearance and strengthens their overall abilities.
Hiro Mashima created the manga to celebrate the 60th anniversary of Weekly Shōnen Magazine's first publication.
Mashymre's name is a corruption of Hiro Mashima's family name.