Ai arrives at the citadel and much to her horror witnesses Kiriko removing the covers blocking Ulla's sense of sight at which point her gaze extracts the life from the people, who are hence reborn as undead. Just as Ulla turns her gaze upon Ai, Julie rescues her at the last second, and are joined by the man in the lion mask. The man explains that Ulla is Koroshiohake, with her power of death being Ortus's dark nature. Ai refuses to believe that Ulla knows the true nature of her power, believing that Ulla had been deceived just as she was, at which point Kiriko appears and confirms this whilst accepting responsibility for the deception. Kiriko further explains his desire to protect Ulla from the harsh reality of their world ever since being appointed as her teacher by Ortus's elders and that he wants the deception to last until Ulla remains as the last living human, thus making her powers meaningless. Ai counters by remembering Kizuna's fear, but Kiriko remains adamant in his decision due to his love for Ulla and instead questions whether Ai would have had the same resolve. That same night, Ai visits Ulla in the castle and reveals the truth about Ortus and both of their powers, which is confirmed by a saddened Kiriko. Ulla explains to them of suspecting something had always been kept hidden from her, but chooses to contently accept everything; her ability, Kiriko's painful task, Ortus's nature and herself, only lamenting of being unable to truly interact with Ai as friends should, but embraces her nonetheless through Kiriko. Afterwards, Ulla takes Ai, Julie and Scar to visit her older sister Celica Hecmatika; a baby frozen in time. Kiriko explains that Ulla's mother hatefully wished death upon all humans at her deathbed, granting the unborn Ulla her power; which was rejected by her twin, Celica. Finally much to everyone's shock, Scar realizes Celica had been calling out to her, and upon Scar's touch, the child enters the flow of time.
In the epilogue, Ulla reveals that she had known Celica was simply waiting for the right person at which point Scar adopts Celica as her daughter with Ulla's blessing. The next day, a mysterious youth with a ghostly companion observes Ai and co. as they leave Ortus and remarks that he and Ai are one in the same.