Warikitta Kankei desukara.

High school student Kaburagi Aya can't get used to the life of a high school student, and regularly uses a dating app. On this app, she meets a 24-year-old woman who goes by KURO, and Aya is fascinated by their conversations. But one day, KURO starts acting oddly, and Aya goes to the apartment building where she lives...