Before Majisuka Gakuen 3
Before the events of the series, Miyu met Yoyogi Keita and she felt something special towards the boy, until Keita met Paru. Because of this, she co-conspired with Peace and The Director into framing Paru for Keita's "accident," which she unknowingly thought to only injure Keita. Blaming Paru even more for Keita's unexpected death, she joined Team Mongoose, both as a spy for the prison, and as a means to get back at Paru.
|Team Habu||Paru | Nobunaga | Peace | Nanashi | Daasu | Nantene | Uruseeyo | Tetsuo | Komimi|
|Team Mongoose||An'nin | Miyu | Bunker | Messhi | Yagi | Sudachi | Shokkaku | Jovijovich|
|Other Characters||Yoyogi Keita | The Director | The Warden|