My father suddenly decided to remarry. As a result, my life changed. In addition to my two real older sisters, I now have two stepsisters, making my life one of 'a younger brother with four buxom older sisters!'

Moreover… One of my stepsisters is a senior I had a crush on in high school… And her older sister, who also didn't know this would happen, and I… have a history together… The world is so small!

Before I knew it, a steamy, erotic, and turbulent daily life under one roof consumed my summer.