The Fable volume 6

Fable, a legendary assassin who can kill any target in one fell swoop, has taken a year off on orders of his boss, moving to Osaka with Yoko, his would-be "sister," to learn how ordinary people live. But then one day, the villainous gangster, Kojima, begins to run amok, breaking his promise to Maguro's captain to start an escort service, ultimately blackmailing Fable's benefactor, Misaki, to sign on as a call girl. When Fable learns of Misaki's predicament, he rushes to her rescue armed with a homemade gun.