When Gray, Juvia, and a Grimoire Heart wizard are linked together by a dark magic, one wrong move could mean the death of all three of them. Meanwhile, Ultear's past is revealed as she confronts Gray--the one she holds responsible for her mother's death.

The guild continues to take on the members of Grimoire Heart as Erza goes head-to-head with Azuma. But when the dark wizard becomes one with the island flora, a secret magic is revealed and the island itself falls into peril.