In the servers, Souta desperately fights the Angelus Gemini in order to protect his world and his friends by placing "Death Flag" upon his enemies. Meanwhile, Nanami found out everyone has forgotten about Souta, and his existence is overwritten. During their graduation day, all Quest Dorm members are going for separate ways. The Quest Dorm is said to be demolished soon. Nanami breaks into Souta's room, and find the letter that Souta received, written by her handwriting, thus breaking Souta's Protect Mode. Riru, who always remembered everything, finally tells Nanami the truth; Nanami is Souta's missing sister. Separated into two, half of Nanami is locked in the jail in Principality of Bladefield, in which she manages to escape and hides inside Ruri. Understanding everything, Nanami unites with her other self. Denying the bittersweet end of the fairy tale, Nanami alongside the Quest Dorm members aim for the happy ending, and went to the underground passage to open the gate to reach and help Souta. Souta, who is tired from all the battle, is saved by the Quest Dorm members, who arrived near Premium Ambriel.
学園祭も終わり、いつもと変わらぬ日々を送るクエスト寮の面々、しかし、菜波はただ一人日常に違和感を感じていた。一方、颯太はある決心をして……
Auf den Servern kämpft Souta verzweifelt gegen die Angelus-Zwillinge, um seine Welt und seine Freunde zu schützen, indem er seinen Feinden die "Todesflagge" auferlegt. In der Zwischenzeit fand Nanami heraus, dass jeder Souta vergessen hat und seine Existenz überschrieben wird. Während ihres Abschlusstags gehen alle Mitglieder des Quest Dorm getrennte Wege. Der Quest-Schlafsaal soll bald abgerissen werden. Nanami bricht in Soutas Zimmer ein und findet den Brief, den Souta erhalten hat, geschrieben von ihrer Handschrift, wodurch Soutas Schutzmodus gebrochen wird.
