One day, Daichi (Hiroki Narimiya) is invited by Hana (Riisa Naka) to go with her to the home of her classmate Seiya Chiba (Tomo Koyanagi), who sits next to Hana and has not been attending school. Hana says that she is concerned about Chiba, who has been sick for six months, and as a member of the class council, she cannot leave him alone.