Sorry, I Can't Let You Go -Sweet but Violent Love From a Yakuza-

Iori Itoh, an office worker, gets dumped by her boyfriend for the lack of sex in their relationship. As she is drowning her sorrows in a bar, she meets her childhood friend, Asuka Tsubaki. He turns out to have grown up to be a very handsome man. When she reveals what's troubling her, he offers to spoil her. "Won't you... have some amazing sex with me? Iori can’t think straight after a few drinks, so she ends up in bed with him. As he makes love to her passionately, he confesses that he’s always liked her! However, he turns out to have a secret! An intense romance with a Yakuza!