Amamiya Brothers

Within the ranks of Mugen are legendary brothers, Masaki and Hiroto Amamiya. The Amamiya Brothers are proven to be both brutal and unbeaten at that time. They have superior martial arts skills that can knock down hundreds of opponents. However, as Mugen disbands, they also disappear. Rumors say that they are in hiding but they suddenly emerge when Kohaku starts disrupting the balance of S.W.O.R.D while carrying it out his revenge. It is revealed that The Amamiya Brothers are looking for their brother.

At the end of High & Low the movie, it was revealed that there is another brother in the Amamiya Brothers' gang. The story about these three brothers unveils in another High & Low spin-offs - High & Low: The Red Rain. The name of the eldest brother is Takeru Amamiya, believed to be the strongest of the three. In High & Low: The Red Rain, it is also revealed that Hiroto is not the blood-related brother as he is the son of the woman whom Takeru and Masaki's dad married in his second marriage. This has been Hiroto's insecurities for quiet some time.