MONROEレーベル5周年記念！！《専属》特別共演作！！父が再婚したという報せを受け、地元に帰省した春斗。だが出迎えたのはなんと4人の美しい義母だった！？一度に4人の妻と再婚した父は幸せなハーレム夫婦生活を過ごしているようだったが性欲旺盛な妻たちは夜の営みに満足していないようで…。若くて体力のある息子に自然と惹かれる義母たちに朝から晩まで妖しい誘惑を仕掛けられた春斗は遂には寝込みを襲われてしまい…。父の目を盗んで繰り広げられる家庭内ハーレム絶倫性交！！

MONROE Label 5th Anniversary Celebration!! Exclusive Special Collaboration!! Haruto returns to his hometown after receiving news that his father has remarried. But he is greeted by four beautiful stepmothers!? His father, who remarried four wives at once, seems to be enjoying a happy harem life, but his sexually voracious wives are not satisfied with their nighttime activities… Haruto is seduced by his stepmothers, who are naturally attracted to their young and energetic son, from morning till night, and is finally attacked in his sleep… A wild harem sex marathon unfolds within the family, hidden from his father's eyes!!