kazuha was coming home angry because his 'dear' sister Shiyizinha ran away from school and didn't see him, he was coming home ready to bother her

when he got home he saw that his mother wasn't home and there was a note in the kitchen, he heard the sound of water upstairs, probably Shiyizinha taking a shower

he went to the bathroom door and opened it with force and anger but ended up seeing Shiyizinha taking a shower with Scaramouche Who is Kazuha's best friend