Takeshi, the son of the owner of the hot spring, is instantly Kokoro by Reiko, a married woman who comes alone to a hot spring that is said to be effective for infertility treatment. One day, while on the bus on his way home, Takeshi witnesses Reiko being molested. However, he is unable to protect Reiko from the men who are maliciously groping her body. Then, that night, when Takeshi happens to meet Reiko in the open-air bath, she touches his crotch and says, "I want to have a child..."