Shimai to no Amai Seikatsu | 姉妹との甘い性活

The Hinata family who got an oversea trip at the shopping street lottery. Parents will go out in spring vacation, three people (Protagonist and sisters) will look after the house.

A older sister and younger sister who are bitches think to use this opportunity to train a weak Protagonist manly. Protagonist that is set in various ways the body and the heart are touched, it changes amazingly.

The relationship between the three people becomes more intimate and happy days until parents return home passes with surprising swiftness...