Mafia Narita (Ayano Tsuyoshi), a mafia member who wants to be good at singing for some reason, invites middle school student Satoshi Okaoka, who is the choral minister, to karaoke to teach him to sing. Although Congshi hates crazy children, he still gives singing guidance, and the two have a wonderful friendship in the process. Gang Congshi, the choral minister, is played by Saito Run, who was selected for the audition.