Not long after Ougai Mori takes the reins of the Port Mafia, his
right-hand man, Osamu Dazai, has a nasty run-in with a gravity
manipulator named Chuuya Nakahara, leader of the Sheep gang. However,
with ominous rumors about Mori's deceased predecessor as well as the
mysterious being called Arahabaki spreading throughout Yokohama, the duo
must put aside their differences and get to the bottom of things. Before
they achieved infamy as the fearsome pair Twin Dark, Dazai and Chuuya
were just boys. Was their first encounter a harbinger of hope or an ill
omen of things to come...?