Red Soul(1980)

Red Soul is a Japanese drama series centered on a family crisis that unravels a devastating secret. Ryoko, a teenager with chronic kidney failure, needs a kidney transplant to survive. Her father Shiro Tachibana, a surgeon, arranges tissue compatibility testing with his wife Hisako, expecting one of them to be a donor match. The test reveals a shocking truth: Ryoko is not their biological daughter. Forced to confront this revelation while racing against time, Tachibana embarks on an urgent search to locate Ryoko's biological parents—the only hope for finding a compatible donor. The series explores themes of family, sacrifice, and the lengths parents will go to save their children, even when the bonds between them are tested by unexpected truths.