XXX or BEAT

Yuuki Tsukimiya is part of the popular idol group "XXXME (Kiss Me)". He's busy every day but enjoys secretly going to the live performances of his favorite band "growly the footman" (GROFF). He is fascinated by the "world of explosions" that is different from the world of glittering idols. One day, Yuuki, who was invited to GROFF's live afterparty, got nervous in front of his favorite band member Aga Daisuke, so he drinks too much and passes out. When Yuuki wakes up at Daisuke's house, who took care of him, he asks Daisuke, "Can you teach me how to play the guitar?" but was asked to do something naughty in return...!?