In Class 2A, where Daichi (Hiroki Narimiya) and Hana (Riisa Naka) are studying, Chiba (Tomo Koyanagi), who had been truant from school, finally starts coming to school thanks to the efforts of the two students. Just then, however, Rinpu Himeji (Haruna Kawaguchi), a yankee girl who is not a student at Monjiro High School, suddenly bursts into the classroom of Class A.