chuuya and dazai backstories didnt change alongside with the personality and abilities. however, in this au chuuya is the one who meet oda and heard his last words whiche means chuuya is the one who left the port PM and joined the ADA, while dazai stayed on the PM, dazai went alongside his words and killed mori the boss of the PM and became the new boss himself(story is beast au + swap au) chuuya and akutagawa were walking untill they saw dazai, chuuya pretanded to not see him

chuuya :"."