After losing his father, Yuji lives with his voluptuous and super-naughty-bodied stepmother Yumi and stepsister Iroha. One day, Yuji walks in on his naked stepmother who later catches him pleasuring himself to her, resulting in the two deepening their stepson and stepmother bond… Yuji’s cold stepsister lies in hiding and watches them together, so she barges in on Yuji in the bath and throws herself on him! This is a lovey-dovey sweet story of an orphaned boy strengthening his family bond through deeper intimacy with his voluptuous and super-naughty-bodied stepmother and stepsister.