The first day of the second trimester, Tsubasa Hanekawa chats with the ghost girl Mayoi Hachikuji en route to school. Right afterwards, she witnesses a giant “tiger” apparition. Later that day, her house completely burns down from a fire.

Worrying about Tsubasa Hanekawa as she lost a home to return to, Hitagi Senjyogahara allows the girl to spend the night at her place. Tsubasa eats a meal prepared by Hitagi and wakes up together with her.

Suruga Kanbaru, an underclassman, came to visit Tsubasa Hanekawa now that she has resumed attending school. Apparently, Koyomi Araragi has asked for Suruga's presence tonight. Tsubasa returned to Hitagi's house without knowing what was going on.

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.

Tsubasa determined the identity of the giant tiger apparition “Kako,” and writes one long letter. The letter was addressed to Black Hanekawa, the apparition that could be described as her other personality.