Constantly on the lookout for her next big adventure, the cheerful and kind Asuka Tsuchimiya is always ready to try new things with her high school friends from the Crystal Radio Club. One day, the group performs a ritual from an urban myth just for fun. However, several conditions had fallen into place to put the ritual in motion, opening the door to a new world of gold and jet black. In this world, Asuka finds a different version of herself and soon finds out that some doors were never meant to be opened.
Source: Sentai Filmworks