(Atsushi has the headmaster last name!?)

atsushi was part of the armed detective agency, atsushi was found by dazai and brought to the armed detective agency.

the armed detective agency knew about atsushi past, they didn't know much until months later when atsushi finally share everything and they were obviously upset, atsushi didn't deserve what happened to him. The armed detective agency love atsushi and they did there best to care and take care of him.

dazai was recently thinking about atsushi past and suddenly he realized something.

Dazai: "hey atsushi...we all know your a orphan but...who last name you have?"

kunikida just look at dazai, wonder what dazai was talking about, ranpo just hum and wonder about that.

Junchiro: "yeah...who last name you have?"

naomi just look curious too, everyone was curious.