The "Secret Exchange App" allows you to find out a secret about anyone, by entering a secret about someone else.

Buto, a student at Teito University, found out the truth behind a case of sexual assault on campus, and she felt compelled to anonymously report it through the app. However, in exchange, she is told a secret that she wished she didn't know. This is a suspense story that depicts the sordid ways that people become manipulated by social network apps.

(Source: Futabasha, translated)