Toba no Ura Bunny-san

A young man got caught up in gambling scam at a yakuza joint. Getting beaten up, his life is slipping from him when a hot dealer throws him a lifeline and bails him out. "Miss Bunny", as he calls her, turns out to be less of a savior and more of wolf in sheep's clothing: a sadist who recognized his masochism. After saving him, she's now his mistress and he's at her beck and call.

(Source: 2D Market)