Yakuza Lover Vol. 4 (manga)

Yuri and Oya’s relationship faces complications when Oya’s father, the boss of the syndicate, issues a warning to Yuri, demanding she cut ties with Oya and the yakuza. When Oya finds out, the situation becomes charged. Meanwhile, a mysterious woman enters the fray, soon to add new challenges to the star-crossed couple’s growing love.