Yu Shirakawa is living with his father-in-law, his mother's remarried partner, at his mansion for the first time in ten years.His sisters-in-law, Ryoko Kyoko, are there. Yu ends up using the study of his father-in-law, who is away for a long time due to archeology work, as his real room, and there he discovers a suspicious bottle. It was a cursed bottle that would bring the greatest misfortune if the women's love juices were not collected within a certain period! ! And so begins a thrilling day with three naughty sisters who care about their younger brother under one roof... (C) 2007 Atelier Kaguya / Pink Pineapple