One day, seniors from Ichiro's photography club came to stay overnight at his house. That night, while Ichiro was passed out drunk, the seniors began taking photos of his beautiful mother, Kimika, as they satisfied their hidden desires. After that, the seniors started sneaking into the house whenever Ichiro was away, strictly training Kimika as their "fleshly sexual relief model." One day, Ichiro returned home early and discovered his mother greedily sucking the seniors' cocks and climaxing repeatedly from toy torture—this sight aroused him intensely. Ultimately, he made the decision to join them.