After marrying at work, Taichi and Kana moved back to his hometown to take over his family's farming business. In this region, an old tradition still thrived where married couples would exchange partners among themselves. Having grown up in Tokyo and known as a sophisticated beauty, Kana stood out among the villagers. She quickly became the center of attention among Taichi's relatives and friends, repeatedly taken by them one after another, gradually drawn into the community's insular customs. Before long, Kana began displaying an outrageously lewd demeanor in front of Taichi, losing herself completely, and unknowingly found herself carrying a child whose father could be any of them.