This is a skyless city, like a box buried underground. The "magic fire" that lights the ceiling is the power source of this city. The protagonist was responsible for receiving the ember of the fire during the city festival and distributing it among the people. One day, a month before the festival, the protagonist encounters a mysterious man who gives her a single rose. Starting that night, she began having strange dreams… This is a story that starts at the "bad ending." What future will the girl be able to reach as she repeats time over and over again…? The "box of the future" has opened. Follow the protagonist as she continues to search for a bit of happiness repeated time.