Synopsis
After living with his grandparents for 10 years, Yuu Shirakawa moves back in with his mother. As it turns out, she has remarried. Her new husband has three beautiful, young daughters who are now going to be Yuu's stepsisters. Due to the nature of his work, Yuu's now-stepfather is often away from home, leaving the house to his children to use as they please. As he settles in his new room, Yuu notices a mysterious package addressed to him. Inside, he finds a glass bottle labeled "Vial of Inanna,...
