Anejiru The Animation / Anejiru: Shirakawa Sanshimai ni Omakase

The main character even have a reason for such a relationship with the sisters. The uncle of this young man, named Huy, was brought from the trip, strange bottle, called "the Bubble of Inanna". On this bottle lay a curse that can only be removed with the help of "female juices". From Yui didn't need to go in search of suitable candidates, because it shared a roof with three charming (Yes - half) sisters. After all, the one who will be able to fill a bottle of "women's juice" and will lift the curse, will be granted one wish. And "Bubble Inanna" with pleasure "tells" a young man a good time to hunt for the precious liquid...