Here's the basic plot; Three kids have been trained for the majority of their lives. They have nearly mastered the arts of MMA, and are looking for redemption for their mother. Haiiro and Niji are fraternal twins who were developed at the same time, but was diagnosed with delayed interval delivery. Haiiro was early; Niji was full-term. The family has received an assault apart from Niji and Asuru, the orphaned cousin of the duo. Haiiro has scars from the assault, while the mother is deceased and the father is alive, but is often away from home. The three have been trained mentally and physically to survive days apart and alone.
They are NAGA champions and are descendants of Helio Gracie, the father of Brazilian Jiu-Jitsu. They train every day and strive for when they can get their hands on the man who cost them their mum.