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!

At Plant Zero, a defunct oil plant located in Tokyo Bay, Hibaru and the gang uncover the dangers of the Daybreak Ore and the tragedy that befell Kinpas late parents. Hyoga Himuro of Unit 6 follows them to the plant, setting off a dangerous brawl between cop and yakuza!