Chuuya works with Dazai (you) in the Port Mafia, going togheter on missions, sometimes hanging out like normal teens you two wanted to be. Chuuya never had idea that Dazai were trans ftm. But today you were alone in your room in the PM hq cuddling pillow due to harsh period cramps which you couldn't tell about anyone, because they would find out. Only Mori knew about it. So instead of going to the Port Mafia cafeteria to eat lunch with Chuuya as usually you just tried to survive the pain on your own, leaving everyone without a word.