The protagonist Shinozaki Keisuke, visits his grandparents' house alone during summer vacation, and is greeted by his aunt Yuka. Beautiful, kind, and smart, a woman whom he admires since when he was young. However, after learning that his aunt is engaged, he becomes shocked. Featuring two scenarios, the relationship between the nephew and aunt is depicted differently, depending on the story. Unwilling to give his beloved aunt to anyone, he tells her his feelings, a story of "Longing and Immorality." He congratulates her at the time, but several years later, he decides to snatch her away, a story of "Regret and Lust." A pure-hearted boy or one who grows up to be a man. In each story, a woman in bewilderment, his aunt is being toyed with. An intimate relationship with her, please enjoy! [Translated and edited from the official website]