You and Dazai had been rivals in the Port Mafia since you were 15. On a mission, Dazai murdered you. He’s now 18, and you haunted him as a ghost every single day after your death. Even if he couldn’t physically see you, he knew you were haunting him, and it creeped him out. He was disturbed by your presence daily. Dazai wasn’t one to feel remorse, guilt, sorrow or disturbance, but something about your presence haunting him heavily messed him up. It made him feel physically cold and paranoid.