Marina became pregnant with Yuto in a youthful act of foolishness. Yuto's father disappeared before Marina's eyes, and her son Yuto was placed in a child protection facility at a young age. Time passed, and Marina was overjoyed to be able to live with Yuto again. She dotes on Yuto, who now has a fully grown adult body, and tries to deepen the bond between parent and child by giving him sex education, but...