At 45, Eriko suddenly finds herself the mother of three sons. Though she struggles with the differing appearances and personalities of her children, she resolves to live life on her own terms. One day, she discovers that all three sons are still virgins. Excited by this revelation, Eriko decides to embrace her role—not just as a mother, but as a woman—and takes action. Visiting her second son Tomoki in his room, she touches his body and shares an intimate, unforgettable first experience with him. In that moment, she discovers a new side of herself and the profound joy of motherhood.