The Sawamura family whose father never returned home because he was assigned to work alone. The mother, Reiko, and her son were envious of their close parents and children from the neighborhood, but in reality they fell into a forbidden relationship that transcended their parent-child positions. I'm not sure if it started with loneliness or with a twist of love, but of course I knew it was unforgivable. One day, my father came back from his new assignment. "This is the last ..." The two who decided to have sex and started having sex run a pleasure that they have never experienced before.