Kyoji Narita is a high ranking yakuza member. On a rainy day, he wanders on the street. He hears a singing sound and he walks towards the sound. There, he meets junior high school student Satomi Oka and he invites him to go to a karaoke place to teach him to sing. Kyoji Narita badly wants to improve his singing so he won't place last in his gang's karaoke competition. Meanwhile, Satomi Oka is a 3rd grade junior high school students and leads the school choral club. Satomi Oka has a sincere personality, but he often makes biting remarks. He has one problem, which is that he has difficulties with high-pitched notes due to his voice going through puberty. Satomi Oka is embarrassed by the unexpected request from Kyoji Narita.