Dotonbori River (道頓堀川, Dotonborigawa), also released as Lovers Lost, is a 1982 Japanese film directed by Kinji Fukasaku.

A nineteen-year-old aspiring painter named Kunihiko Yasuoka meets a woman when her dog Kotaro knocks over his painting easel.

His boss Mr. Takeuchi accompanies him to bury his mother's ashes, who has formerly died and left Kunihiko without any relatives.

The boss's son Masao challenges junkie pool shark Kozo Watanabe to the best of nine games for a prize 300,000 yen.

After Masao wins, Watanabe tells him that he would be even better if he learned the secret technique of his father, Tetsuo Takeuchi, who had been a pool shark 15 years earlier.

She turns out to be Satomi Matsumoto, one of their classmates, and only gives them half the money, promising to pay the rest the next week.

Satomi visits with the other 150,000 yen that Watanabe owed but Kunihiko tells her to leave it at the pool hall for Masao.

The owner reveals herself to be Yuki, the granddaughter of Tamada, one of Mr. Takeuchi's opponents 15 years earlier before he quit playing.

Machiko finds her dog Kotaro again and sees several police cars racing past her as she wonders why Kunihiko is late.