After stomping the guild master, Selene takes over Diabolos and commands the seven strongest members to embark on a special quest. They must navigate their way through an enormous secret labyrinth and find Elefseria's heart. However, because Selene's gotta Selene, she makes the quest a game where she can enjoy the spectacle of seeing the members of Diabolos fight against Natsu's team in a deadly race to see who can reach the heart first. With half of the members of Diabolos supposedly at Suzaku's level of strength, it's going to be a game of survival for Natsu's team!