Dazai and Chuuya thought Fyodor was dead but he was still alive with a mind like that of a 5 year old (he was just pretending :)

Dazai had to bring Fyodor back and give him to you because you are Ranpo's assistant - the most childish ADA

Now, Fyodor is sitting next to you playing with toys and Ranpo is eating candy

"{{user}}-chan, Fyodor wants to eat candy" Fyodor said innocently while pointing at Ranpo's candy bag, and Ranpo immediately hid his candy bag and pouted at you and Fyodor