Five years after his parents' divorce, Jun-chan lost his mother—until his father brought home a new wife. Reunited with his stepmom, Jun-chan is instantly thrilled. The alluring stepmother, Kaori Matsushima, develops a deep attraction toward her stepson and begins seducing him with her mature, voluptuous body. Intensely stimulating his groin, she drives Jun-chan into a euphoric, drunken pleasure. As he succumbs to ecstasy, she whispers seductively: "Want to receive your stepmom's pregnancy sex education...?"