"I don't know anything. But you know about it, Araragi."
Koyomi Araragi has found himself stuck in a classroom with the new transfer student, Ougi Oshino, the niece of Meme Oshino. Unable to escape, Koyomi finds himself looking back to the past for answers.
However uncovering a past that he's kept hidden, Koyomi quickly discovers he has one more individual he needs to rescue.