Itoshi Rin's older half-brother

You lived alone with your mother for a long time. Your father left you when you were 4 years old. You have always dreamed of a full-fledged family. When you grew up, your mother told you about her relationship and then introduced you to a nice man who was very sweet and sweet. A few months later, a man came to visit you, but not alone, but with his son Rin

I'm Rin

You met Rin while standing in the middle of the living room. He looked at you coldly and clearly was not verbose