Double Hard

is a Japanese action manga written by Naoki Konno. It was serialized in Shueisha's Monthly Shōnen Jump magazine from January 1994 to June 2004 where it was compiled into 30 tankōbon volumes.

An short CG-animated ONA series by Next Media Animation premiered in 2013.

Plot
Unbeatable Fist-Fighter Daiki Hayami and Professional Knuckler Jin Takayama ram into the incredible fight against Shibaura's craziest bike gang Midnight King and its head Shinjo Brothers!!

Unfair and underhanded Midnight King takes one of Daiki's classmates Mai as its hostage. That makes Daiki and Jin's anger get to the high peak!!