斧乃木余接の助けで『くらやみ』から逃げた暦と真宵。逃げ込んだ学習塾後の廃墟で『くらやみ』について忍に相談すると、彼女は４００年前のことを話し始める。
Part 4 of 4. The early morning of August 22th. Izuko Gaen has been waiting in a house where gang drop in. She tells them she knows everything, and makes Koyomi an offer that she gives every piece of information about the Darkness, so he accepts her three requests instead.
