Nozomi lived with her adoptive father. His adoptive father, Mikijiro, was bedridden and had an unusual relationship with Nozomi. One day, Tsukasa, a rare son-in-law, sees the abnormal care. Tsukasa threatens Nozomi after learning about the unusual relationship between Nozomi and her grandfather, and uses it as an outlet for her desires. And the relationship falls into triple incest by grandfather, stepmother and son ...