Yoru, Tomosu

In Kagurahara Jogakuen, which has been around since the Taisho era, it is said that there was a secret exchange among the girls called "Pseudo Sisters". It is a special relationship in which the girls would exchange their most important possessions and sign a contract to become sisters until graduation. However, one day, the two girls who signed a contract to become "Pseudo-sisters", committed double suicide, and the teachers treated it as an accident. In modern-day, a series of strange incidents fall upon to five girls who attend Kaguhara Girls Academy. One day, A transfer student named Yuuka joined the koto music club while practicing for a competition. However, while Yuuka listens to the…