Hayate and his party members continue to go on the butler quest. Hayate is poisoned by a poisonous spear after saving Nagi's life. Meanwhile, Hinagiku and Isumi are on the quest to help Hayate and exorcise this evil spirits, respectively. Hayate's group encounters the now-dead, ghost priest of the church, Rin Regioster, who points out Sister Fortesia to be a fake. The sister is takes control of a plug-in giant size robot to enact her revenge against the Sanzen'in family. While Fortesia and Hinagiku are fighting, Yukiji is possessed by an evil spirit, and attacks the others, also using the giant robot. Hayate exudes more power and destroy the robot, while Isumi exorcises the spirit possessing Yukiji. Back at the mansion, Hayate collapses after the butler quest.
ハヤテの執事復帰への試練、それはアレキサンマルコ教会の地下に広がる巨大迷宮、その最下層にある「執事のメダル」を手に入れる冒険。つまり「執事クエスト」のクリアであった。クエストクリアに挑むのは、体力自慢の雪路、とばっちりで強制参加のワタル、そしてナギとハヤテ。こんなメンバーでクリアできるのか!?
