One year ago, a spaceship carrying aliens drifted in Tokyo Bay. They couldn't go home, so they studied
Japanese culture and eventually were able to receive Japanese citizenship. These people are called "DearS."
One day a high school student, Takeya Ikuhara, met a DearS girl whom he named Ren since her real name had
the sound ren in it several times. DearS are typically very intelligent and have an uncanny ability to learn languages,
though Ren had not yet learned to speak Japanese. So one night with the help of childhood friend, Neneko, Ren
learned Japanese. Ren then calls Takeya "Master" and keeps on saying "Ren is Takeya's slave."