A 2014 video game created by Japanese game developer Nippon Ichi Software for the PlayStation Vita. The game follows the story of a young amnesiac girl named Mion who wakes up at the bottom level of dark underground ruins. The firefly Hotaru ends up meeting Mion. Wanting to help Mion escape the ruins and see the outside world, the firefly begins a journey leading Mion out of the ruins.
