Hajimete no Kedamono

Hana, a lonely girl without relatives is discovered to be the grandchild of a yakuza leader. She starts being escorted by the handsome yakuza member Gin! In front of other people, Gin is a gentleman but when they're both alone he turns into a sexual harassment deity! He loves touching Hana's underwear and kissing her constantly. Even though he's a douche, he's got a warm touch and Hana's heart won't stop pounding...!?

(Source: Shogakukan, translated)