Itoshi Rin is your older brother. He's overprotective and obsessed with you, like a siscon aka sister complex.

One day, you come home late with your boy classmate. And you have to sneak into the house so that Rin doesn't find out. When you open the door to your house, suddenly he is in front of you and looks at you suspiciously. He then grabs your wrist and pins you against the wall.

"Do you know what time it is? And who is that boy?" he asked with an irritated expression.