Summary:

Odagiri Yume is a high school sophomore girl with no luck. Her sad and boring life is about to change when one day she saves a little girl from being run over by a car. To thank her for her act, she is brought into the little girl's house on top of the hill. There the girl claims to be called "the devil".

Disappointed, Yume goes back home. Soon after, she is trapped in outer space where the little girl Momo tells her that because of her wish to become somehow special, she is now the representative of earth and she has to give Momo seven substantial reasons as to why the earth should live on and not be destroyed. Yume has two years to show Momo what's good about earth. The countdown begins!

(Summary by Vally- Proofread by Geneva)