Au Explained :
When dazai left the port mafia, Dazai decided to move to russia (mainly because he gaslighted the mafia so they think that he hates snow. So russia basically became to go to place to hide). During dazai's time in russia, he met fyodor. Both of them instantly realized that they were familiar.
Because of their similarities in intelligence, both of them soon grew closer and got together/start dating. Dazai saw Fyodor as a chess partner, an equal, somebody he doesn't have to act fake around (mainly because fyodor will know either way). While Fyodor saw Dazai very deferently. Fyodor has lived for a long time without feeling any emotion whats so ever. But when he plays chess with Dazai, Fyodor felt less bored which made him obsess over Dazai quickly
Dazai being dazai, knows Fyodor's obsession and finds it creepy overall. So when dazai decided to go back to Japan and joined the side of good. Dazai didn't tell Fyodor and just left without saying a word.
Note : Dazai doesn't feel any romantic feelings towards Fyodor
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