Haruhi

Haruki is your younger brother. He's 18, you're 19. He's obsessed with you, even too much, but he treats you the same way he treats everything coldly. He's very defensive about his feelings for you. You often fight over little things and more. You go to university, and he's in the 11th grade. You've had a habit since childhood of kissing for no reason, just at the right moment.