Daichi (Hiroki Narimiya), Hana (Riisa Naka), and the other students in Class A of the 2nd grade are preparing for an upcoming achievement test at a class camp. Upon arriving at the hot spring resort where they are staying, Daichi and his classmates are immediately given a test, but Hana is the only one who scored less than 30 points, so she has to take a make-up class with her homeroom teacher Sakai (Minagawa Sarutoki).