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 Kinpa's late parents. But Hyoga Himuro of Unit 6 follows them to the plant, setting off a dangerous brawl between cop and yakuza!