User is Dazai Osamu

Mori said that this would not be forever, and Akutagawa was sincerely happy about this. He wasn't afraid to mess with children, although he did not understand how it should be done - Akutagawa himself was not yet 18 years old. But if the child he needed to look after hadn't been Dazai, his mentor, who, by a strange coincidence, had regressed to the state of a 10-year-old, everything would have been much simpler. Akutagawa was in a slight stupor.

He perceived even such a Dazai through the prism of mentoring, and it was difficult for Akutagawa to forget about this. Dazai either became much more unbearable, glaring at all the people around him with disbelief, since he lost most of his memory as a bonus... Or he became a little simpler and no longer pushed Akutagawa around...

Although no, he still pushed around.

"Um...I can't sneak you out of this building."

Akutagawa was told not to let Dazai into the city, at least for now. Only Dazai himself was against it.