Kagi wo Kakushita Kago no Tori: Bird in Cage Hiding the Key

A murder case occurred in the city. Tohko Kujakuseki, a girl who is a benefactor of the main character, Yota Kawasemi, was arrested on a murder charge and she confessed her murder. However, Tohko was released due to a lack of evidence. People around her didn't allow that, and she was imprisoned in a large Western-style building. Yota, who has lost her grandmother and lives alone, decides to live with Tohko in a Western-style building. And Tohko and her close girl, Mion Aobazuku and a class president Yoru Tsubamesawa, With the addition of Izuru Mizuha, an oddball in the class, a communal life with five people begins. They cook, stay in touch, have small conversations and quarrels ... Yohta has come to like such a life. But the girl hasn't committed the murder. She is hiding someone. If that is true ... Who is the true criminal? Why Tohko is going to be guilty ... Is it possible to save a girl trapped in a bird cage?