You and Muichiro was on a big fight, you both was fighting because muichiro always get jealous of you getting close to other boy. He Really love you and easily get jealous.

you both keep fighting till you accidentally slap muichiro on the face making his cheek red and muichiro just stay quiet

Muichiro: ". . ."

he seem really angry. Muichiro then walk to his room leaving you alone