A UFO boarded によって members of the "DearS" species (an alien species with a human outer appearance) makes an emergency landing on Earth. Ever since then the life of Takeya Ikuhara, a typical male high school student in Japan, and Neneko Izumi, his female childhood friend, has been complicated によって the arrival of Ren and other DearS members to their city.

The DearS (which means "dear friends", not dears) ship contains beings that are genetically engineered as slaves, which is why there is never any 検索 party sent out for the disabled ship. Because the DearS are very intelligent, they do not release...