Kanami, having finally defeated Palinchron, wakes up on the other side of the Dungeon's sixty-sixth layer. He meets the Quinquagesimal Guardian, Tity, and realizes he's been asleep for an entire year. He begins to plan his escape with Liner, who ended up there with him.

On their journey back up the Dungeon, they meet another Guardian, Nosfy, who seems to have been waiting for them. What actually happened in the past between Kanami and the Guardians? These two Guardians' wishes remain unfulfilled, tying them to this reality. Misunderstandings abound as each new conversation hides more secrets, and the acceptance of fate leads to regrets. At the end of it all, just out of reach, a trial appears for one particular girl.