Chaka: The Lonely Hitman(1998)

Original title: チャカ LONELY HITMAN

Shima (Riki Takeuchi), the right-hand man of his yakuza boss and renowned hitman, suffers from kidney disease. Interned in the hospital, he meets Junko, a nurse. When Shima is shot, she goes home and heals him. Gradually a relationship is formed between them and Junko gets pregnant. But Shima cannot escape the obligations of his clan and the disgust of Junko...