Uncomfortable after quarreling with his sister on Mother’s Day, Koyomi leaves the house. Hitagi bumps into him at the park and makes an offer.

Koyomi and Hitagi meet a girl named Mayoi Hachikuji in the park. She seems to be lost and cannot find her way home. The two try to help her.

An apparition is behind why Mayoi is unable to reach her mother’s house. Receiving advice from Meme, Hitagi tells Koyomi the surprising truth.

Tasked by Meme, Koyomi heads to a lonely temple to attach a prayer slip. There he sees a dead snake that has been severed into five parts.

At Hitagi Senjyogahara's discretion, Hanekawa Tsubasa ends up living under the roof of the Araragi residence. Spending an evening in Koyomi's house, Tsubasa realizes that she had turned into Black Hanekawa the previous night.