50-year-old Shizuka is divorced and lives alone with her son. Her son is a writer, but he's been feeling down because his work isn't selling well. One day, she hears him call out from the bathroom, "We're out of body soap." At that moment, his cock pops into her mind and she can't think of anything else, her body and mind deeply stirred. An unexpected, shocking event suddenly disrupts her daily life, profoundly shaking Shizuka's heart.