Double Hard
English name: Double Hard
Genres: Action
Type: ONA, Episodes: 26
Aired: 2013 to ?
Studio: Next Media Animation
Source: Manga
Rating: PG-13 - Teens 13 or older
Synopsis:
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!!

(Source: Crunchyroll)