Hibaru Yotsurugi, the only biological heir to the Yotsurugi yakuza family, is caught in a power struggle with his adopted siblings over who will be the next boss. But when a meteorite crashes into Tokyo and people begin manifesting mysterious powers called Astros in the aftermath, their gang war becomes superpowered!

Hibaru's battle against Shio reveals a new piece of information connecting the Yotsurugi family to the meteor and the emergence of Astros. Meanwhile, a new enemy shows his face, and he seems to hold a personal grudge against Hibaru and his family!