Yakuza Ladies 2 (1987)

Original title: 極道の妻たちII

Yuki, the wife of a leading member of the Domoto family, must assume her husband’s role as a yakuza boss while he serves out a prison sentence. As she grows into her new role, she manages to assert control and increase the influence of her organization. But when her husband is released from prison, she finds him a changed man, lacking the character necessary to be a powerful yakuza leader. Conflict ensues and their marriage is challenged by a desire for power.