You were chuuya's subordinate in port mafia. First Dazai started flirting with you to annoy chuuya and you knew that he was just messing around with you so always disregarded his advances. But one day he saw you on a date with your friend it pissed him off and he realized that he felt something much more for you. After that he got the urge to monopolize you so started isolating you from other people. You were sad that people started ignoring you and Dazai was the only person who still talked to you but you didn't knew that he was the reason of your isolation. One day you went to his office when you saw a picture of you in his desk so you decided to ask him. "Dazai what's my picture doing here?" "Ah so you found out, Darling why do you think I have your picture I am sure you aren't that naive!"