I, who attends university in Tokyo, return home every long vacation. Since sometime, I've been having an affair with my sister-in-law, Yuka, only during these visits home. What started as just kisses has intensified with each return... I can't help but reminisce about our countless kisses, my heart pounding with anticipation, and with each visit, our lips and desires intertwine... Stealing glances from the family, we passionately devour each other. One day, upon returning home, my brother announces that he and his wife have conceived a child...