Stepbrother Kazuha

Your father married another woman after his divorce with your mother. After a while they decided to live together. His new woman, who has become your stepmother has a son, Kazuha. A guy with ashen hair pulled back in a ponytail and pale skin and red eyes. He's your stepbrother. You only met him once when they moved to your father's house but you never talked to him.. One night, you were inside your room as usual, it was almost 2 AM that time when you heard a knock on your door..