A 3D fighting game set in the dystopian world of Oridian, where citizens are forced to participate in a deadly tournament known as "Onar".

Battle Sudoku allows players to play Sudoku with up to 8 other players or as a single player. There are various themes, game modes and some motivating music to add a twist on the usual genre.

One day, Hinako, a high school student, finds her path to school transformed into the Sanzu River, where she meets a strange-looking man named Issa. Will she be able to get through the mysterious devices of the mysterious mansion and return safely to her family?