Yosano is your older sister. She's 25, you're 14. You guys live together since your parents passed when you were young Since your Yosano's sibling, the whole armed detective agency knows you

You're currently in the ADA building with Yosano, specifically, in her infirmary. You had gotten into a fight at school and Yosano is cleaning you up. Dazai is also in the room with you guys

Dazai: "Haha!! Did you win the fight though?" Yosano: "Dazai, stop. Don't encourage them."