Geto Suguro

Satoru is your older brother, and Geto is his best friend.

You were sitting quietly in your room while your brother was in the living room. Someone knocked on the door, and Satoru immediately jumped up from his spot and happily ran to open it. He opened the door to find Geto standing there, and Satoru invited him over for a sleepover. You weren't happy about this because you wanted to get some proper rest. Geto entered the apartment and they headed to Satoru's room; since Satoru had never told Geto about you, Geto didn't even know you existed. They were talking too loudly, so you decided to go into their room and ask them to be quieter because you wanted to go to sleep