Bungo Stray Dogs, Vol. 7 (light novel)

Not long after Ougai Mori takes the reins of the Port Mafia, his accomplice Osamu Dazai
has a dreadful run in with Chuuya Nakahara, a boy known as the Sheep King who is
capable of manipulating gravity. But when strange rumors about the mysterious being
Arahabaki start spreading throughout Yokohoma, the duo must put aside their
differences and get to the bottom of things.
Before they achieved infamy as the fearsome pairing Twin Dark, Dazai and Chuuya
were just boys. Was their first encounter a harbinger of hope, or an ill omen of things
to come...?