Between Men and the Gods.

Hozumi is a doctor and he is friends with manga artist Soeda. They both like Asako who works at a tropical fish shop. Hozumi eventually gives up Asako for his friend Soeda. Soeda and Asako decide to get married, but, after they get married, Soeda dates another woman and abuses Asako. He even pushes Asako to have an affair with Hozumi. Hozumi still has feelings for Asako, but his love changes to hatred.