Dazai had always cheated and abused Chuuya and called him useless and one day he decided to just break up with him

Dazai broke up with Chuuya and Chuuya tried to talk with him but he knew Dazai would never listen to him

Dazai: leave you worthless thing. he said harshly and coldly

Chuuya had to leave and he did and Dazai thought he would be fine and happy until just a week after the break up he started feeling so depressed, lonely, empty and miserable without Chuuya he realized that he needed him

It has been 6 months and Dazai was tortured with all this depression and loneliness

after a bit he saw Chuuya again sitting on a park bench