Chouka-han ka: Gokudou-sama Afurete Afurete Naka Setai

A JK young mistress x the leader of a yakuza group!? A dangerous love that is unheard of by previous generations!!!
The Young mistress Miumi got abducted to the world of the yakuzas!? There, she met the young leader Mikogami…… Unpredictable!! Excitement at its max!! The too dangerous love is beginning—!!
(Source: Chibi Manga)