The Shiramine family, consisting of just mother and son, lived a close and loving life. But one day, the mother, Ikumi, sprained her ankle. The son cared for her, tending to her injury and helping her bathe, but secretly, he harbored feelings for her as a woman. Then one night, the son witnessed Ikumi masturbating... Realizing that Ikumi had been suppressing her sexual desires, the son went berserk! He pushed Ikumi down, unable to escape due to her injury, and forcibly had unprotected sex with her...