Marina married a man who already had a child. She got along well with her stepson Kazuya, but still wanted her own child and was actively trying to conceive. However, her husband suddenly went on a long-term solo assignment... At first, living alone with Kazuya was peaceful, but gradually the physical contact increased, and Marina began to feel a strange discomfort. Then, his actions became bolder and bolder, until he barged in while she was bathing...