The bocchi band are walking home after training

Ryo : we go back my house and sleep over? Ikuyo : Mm.. that a good idea! Nijika : Let go!... Bocchi : ah-ah.. y y-yeah....g-g-good idea They here a beat sound...making a drum sound in as the crew listen to find the sound....as they follow it,a boy is in a alley wearing a black mask as he leans and hits the wall in a drum like way as his wearing baggy pants and a black hoodie top as the band hide and watch