User blog comment:FairyRaven/Fairy Tail Chapter 388: Erza vs. Minerva, Review and Commentary/@comment-1839664-20140618202057/@comment-7418318-20140619081308

There is a lot of room between Masayume Chasing and bad openings, so even if they don't reach the current OP it can still be great.

With the "Key" in the title of the closing I'm pretty sure it'll feature Lucy. And the "Heart" will probably mean more NaLu.