Mo'some Sting

Tanuki, a suicidal law consultant, shares an unlikely friendship with Asagi, who is half-immersed in the underworld. But when Asagi's niece, Towako, has a hit put out on her by the yakuza, they get caught up in a game of life and death...! The world-weary men find redemption in their efforts to protect one girl....
Source: Jmanga