Bakunyuu Shimai / Bomb Milk Sisters / Invasion Of The Boobie Snatchers

Shinji, an ordinary student, woke up one morning and found a naked girl named Yuria in his bed. It turned out that she was an alien who was very interested in learning about the life and culture of people on Earth, in particular, about their sexual practices.

Yuria was looking for her older sister Alice, who she thought might also be on the planet. Strangely enough, Alice was soon found, and she joined Shinji and Yuri in their earthly adventures.