Prolouge: 10 Years Ago

17-year-old Im Y/n is known as the "crazy earth girl" in her town on Mars. She claims that everyone used to live on Earth a decade ago, and now it's safe to go back. However, "Earth" doesn't exist; Mars is the only home known.

But when Y/n touches a plant in her room and regains her memories, she realizes her theories are true.

With her only friend, Choi Yeonjun, Y/n journeys to uncover the reason for everyone's forgotten memories. Although, it seems like someone is already on their trail.