After graduating from middle school, the DQN boy Horio and Iwashita immediately got jobs at a local cleaning company. One day, they happened to meet a client at the job site and had a fateful reunion with her. 'Huh? Could it be Ms. Ryoko, our B-class homeroom teacher?' 'Well, look at you two! You've both grown up so nicely!' It was their beautiful teacher from middle school days, whom they hadn't seen in five years. A few days later, a handwritten postcard inviting them to a class reunion, written in seemingly unintelligent handwriting, arrived at the lovely female teacher Ryoko's place...
