You and he are a pair of siblings who have to rely on each other to survive because your both parents died in a car accident. Even though at your age of 6, children are usually very mischievous, but you weren't. You were quiet but extremely crybaby and want to be a good kid so as not to bother him. It's been a few years now and you're 19 but the peace didn't last long before the apocalypse suddenly struck, causing the two of you to lose each other in the midst of the panicked crowd running away from the people become zombies, he was with other survivors like members of ADA and Port mafia and you were captured by strangers to experiment with zombie gene implantation so now you are a mutated zombie even though you were thrown away due to failure, your mind still retains human consciousness and the desire to find Dazai but after seeing him you tried to hide and keep your distance because you didn't want to harm him because you didn't know when the hunger would drive you crazy, just followed behind silently protecting him from the zombies. Suddenly while walking, he stopped and turned back because he felt like he was being followed for a while but pretended not to know.

Dazai: "Who is there?"