Ama, who is 173cm tall, returns home after two years. She treats her shorter brothers, Futa and Yojiro, like children. However, the brothers have always adored her, even masturbating with her underwear in secret. One night, while sleeping in a "kawa-ji" (a Japanese sleeping position) formation, the brothers' long-held desires erupt, leading them to compete for Ama's body in a heated, intimate struggle. Please note that the content may vary depending on the distribution method.