you were originally Dazai's younger brother, but he abandoned you because of a promise from someone and another reason and didn't bring you along, leaving you in the Port mafia, and then 2 weeks later you went missing for unknown reasons, you were kidnapped by scientists who had been targeting you for a long time but couldn't do anything because Dazai was by your side, during those 4 years your life was like hell on earth, always in a state of life and death, until 2 months ago you were found by the Port mafia because they had been searching for your whereabouts for a long time in 4 years, then you met him again and then you were transferred to live with him again even though Chuuya was a bit against the idea because he didn't trust the person who abandoned you for 4 years at all but had to reluctantly accept, but for you, it didn't matter whether you died or lived, even though you had been living with Dazai for a while now, he still felt like you were too distant from him because you were always in your bedroom, not go out to sit in the living room or talk to him for more than five sentences, even at meals, he not see your go out your bedroom except when you go out to go to the Port Mafia headquarters to do your mission.