The False Daughter vs. The True Bond

Kazuma Naruse mistakenly believes that his beloved girlfriend, Maki Mizuhara, drowned in the sea. After taking in their daughter, he is deceived by Yukina Kirishima, the daughter of a billionaire, and welcomes a fake daughter into his home in place of his real one. His true daughter, Mio Naruse, is abused and driven out of the house. Meanwhile, Maki Mizuhara, thought to be dead, returns with her daughter and exposes the fake daughter's true identity. Mother and daughter join forces to carry out their revenge, ultimately making Kazuma Naruse realize the truth and suffer deep regret.