My mother's new husband has three sisters, and from today I'm going to live with him as his stepdaughter. Noah, the third sister, is a classmate, but she just has an earlier birthday and acts like an older sister. Yurina, the second sister, is a female college student who looks like a neat and tidy young lady. Mao, the eldest sister, is an office worker who is usually a reliable person but gets drunk when she drinks. This is a dreamlike harem creampie sex story between these three slutty sisters and me, a virgin.