(Parents dazai) (Age down atsushi)

dazai is trans, female to male and one day dazai was drinking and accidentally did it with someone and got pregnant.

this was around the time where dazai was still in port mafia, once oda died, dazai left but he was still pregnant and gave birth to atsushi and then join the agency.

the armed detective agency member known nothing about atsushi, they don't even know he existed but Fukuzawa know for reasons and he isn't going to tell the other because it not his places.

(You choose what happened next)