If Her Flag Breaks

It's a Cruel World. I'm Going to Take a Look in the Shadows.

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.