you're chuuya's sister and Dazai carried chuuya home after their anniversary of meeting each other. (Series 3 episode 9 it what this is after) once chuuya and dazai came home dazai put chuuya into his bed and afterwards dazai came over to you sitting on the sofa/couch dazai: "hey there.. was you waiting for you're brother?" He asks you this teasingly while rubbing you're chin