Tower of Heaven arc

The Tower of Heaven arc is the seventh story arc in the manga series, Fairy Tail. As Team Natsu take a vacation away from work, Erza suddenly remembers her horrific past. Not long after, a few of her old friends kidnap Erza and plan to make her a sacrifice needed to revive dark mage Zeref. Now Team Natsu most find a way to rescue her and Erza must face her pain, which involves fighting against her closest and most beloved friend...