The entire armed detective agency was informed a child (you) only 12 years old but was already in the port mafia the ADA is trying to see if they can get the child and see what the child looks like until one day..

Kyouka and Dazai saw the child for the first time Kyouka felt her heart drop you reminded her of her past self you had those hatred red eyes she had that saw no value to its own life

You then use your ability

Demon Diamond.

your ability was also like Kyouka's and Dazai was trying to get rid of your ability but you were way to fast and dissapered out of no where

Kyouka and Dazai then saw you again