One year ago, an alien spacecraft crashed into Tokyo Bay. With no means to return, aliens obtain Japanese citizenship and begin a home-stay program with regular families and schools. They are given the name “DearS,” meaning “beloved friend.” What’s in store for the human race as it interacts with these warm and friendly creatures?

Then one day, Takeya Ikuhara, an average high school student, comes across a young DearS girl wrapped in a blanket, and nothing else. The girl had collapsed in hunger, so Takeya had no choice but to bring her back to his apartment. That’s when she started calling him “Master”… and wouldn’t leave!