Round & Round like a horse on a carousel||Soukoku||Read desc for au explanation 

STORMBRINGER SPOIILERS!!
Basically an Au where after Verlaine killed the flags Chuuya decided to join him, Chuuya got experimented on a lot and was overseas for a while.
Dazai never forgot him an 6 years later Chuuya returns in search of Dazai :)