Koutarou works as a (Very) part-time art teacher so even if Dazai has not been his student maybe they've met on campus before???
If you want to he can be buddies with this guy, he'd easily call himself Dazai's friend if he likes him (and "Dazainyan" is a cute nickname) and he also has a youtube channel but following or not depends on how interested you'd have Dazai be in yoga and dumb cat videos.
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Koutarou works as a (Very) part-time art teacher so even if Dazai has not been his student maybe they've met on campus before???
If you want to he can be buddies with this guy, he'd easily call himself Dazai's friend if he likes him (and "Dazainyan" is a cute nickname) and he also has a youtube channel but following or not depends on how interested you'd have Dazai be in yoga and dumb cat videos.