A Little Pain

Ever since he was young, Miura Yuki, has been living alone with his older brother, Miura Seiri, since their parents died in a car crash. Despite the fact that they only have each other left, Yuki now wonders why his older brother has been cold towards him since the day he was born, and why he has always hated his very presence when he's around. Is it because Seiri simply hates Yuki? Or there's even more to it?