sano family were living normally until one day izana find out that he wasn't really related to this family.
After the fight between Shinichiro and Izana because Shinichiro lied to them about Izana being their brother, Izana started to become quiet and depressed. Mikey was really worried about him.

mikey saw izana that was sitting behind the open window and looked outside without even caring about the cold weather.
he went to izana's room and looked at him worriedly. "izana..."