Ritsuka was ready to give up on music until he met Mafuyu Satou; now Mafuyu is taking guitar lessons from Ritsuka, who, after hearing Mafuyu's strikingly beautiful voice, hopes to make him the lead singer of his band.

"It's stuck deep inside me and I can't get it out of my head. Mafuyu's voice is an insane and dangerous weapon." That day, Ritsuka Uenoyama started to feel that playing the guitar and playing basketball, both of which he liked very much, were becoming boring. He then encounters Mafuyu Sato, who's holding onto a broken guitar, and decides to fix it. The moment Uenoyama finishes fixing the guitar, Mafuyu becomes completely attached to him. However, after hearing Mafuyu sing it leaves a deep impression on him.