Months pass since Beerus the God of Destruction went to earth and fought The Super Saiyan God Goku...Whis decided to train Goku allowing Vegeta to come along as well..Goku managed to become a Saiyan God easily while Vegeta can't it is revealed theres another a counterpart a Super Saiyan Devil

Atushi means Kind Gentleman and Kurokawa means Black River. Atsushi is only a kind gentleman when he is in his human form, but when he is in his dark form, he becomes Black River. Atsushi/Kurokawa is one of The Thirteen Unknown