Briefly about Otome No Harawata Hoshi No Iro manga:20 years ago, aliens landed on Earth in search for marriage partners. They are perverted and love breeding with us. With their advanced technology, they have solved all the problems regarding the environment, food, and resources. Amongst humans, there is an organization that studies alien life called R&D. R&D is headed by Dr. Kamiya and his assistant Sayori. Dr. Kamiya sends students to various countries in order to collect data by interacting with them and observing their lifestyle and habits.''