Middle school student Satomi Oka should feel proud that his choir group placed second at a national competition. However, he sees this achievement as a failure stemming from his own inadequacies. Moreover, with graduation fast approaching, his tenure as choir leader is drawing to a close. While Satomi is consumed by his inner turmoil, a smooth-talking gangster named Kyouji Narita approaches him and asks him to be his singing teacher. Every year, Kyouji and his colleagues enter a karaoke competition, where their boss personally designs a tattoo for the loser. To avoid such cruel and unusual punishment, Kyouji asks Satomi to help him find the best song suited for his vocal range. Though reluctant, Satomi sets aside his fears and agrees to join Kyouji at his karaoke practice sessions. But it remains to be seen whether the mismatched duo will overcome their respective obstacles or fail miserably.