Little Battlers eXperience, originally known as Danball Senki is a series of action role-playing video games created by Level-5, involving small plastic model robots known as LBXs that fight on dioramas made out of cardboard, with the main character setting out to battle against LBXs created by other characters. The first game of the series is released on June 16, 2011 for the PlayStation Portable and has expanded to 6 official games and three Japanese anime series.

In an unplanned field trip, Riko is transported to an alternate Japan where metal-based life forms known as Mimesis ravage the world. Only girls equipped with LBX armored weaponry can stand up to this scourge. Joined by four other displaced young women, Riko will have to adapt to save humanity. The hope of a planet now rests on these heavy metal soldiers who desire one wish—to return home again!