Maki, a wife who feels happiness despite her exasperation at her husband's obsession with shogi and his daily games with his nephew Masato. One day, her husband is suddenly called away for work, leaving Masato alone with Maki... Masato, who has harbored a secret longing for Maki since long ago, cannot resist her vulnerability and seizes the moment to overpower her. Maki resists, but due to her sexless marriage with her husband, she unconsciously feels a weakness towards Masato's robust physique and ends up accepting him. From that day on, their hidden desires run wild, drastically disrupting their daily lives...
