Koenji Takashi and his wife, Reiko, have no children. - Takashi himself was convinced that there was nothing he could do in the future. - Neither of them have any physical problems. - They simply don't have much sex. - ...What is the cause? - That is a spiritual problem... - The cause is his uncontrollable feelings for his stepmother, Misato. - When they were young, one night's mistake turned their lives upside down. - Then, the day finally came when he could no longer suppress his thoughts...