Dazai recently gained new popularity because of the rediscovery of “No Longer Human” on TikTok and a pair of anime shows that use him — or obvious analogs for him — as a protagonist ...

The portrait had been in the possession of Tatsu Ishii (1923-1964), an editor in charge of Dazai’s “No Longer Human” and other works. But he died without providing details about the piece.