Neo Kyoto is a city with an RA infrastructure and ruled by the King, but it is also a world where a person's social and economic status is determined solely by their abilities in a game called Build-Divide. One day, Teruto Kurabe is wandering the city with a piece of bread in his hand and discovers a girl named Sakura Banka who is being attacked by a thug, so he uses the power of a mysterious card in his possession to save her. Upon witnessing his powers, Sakura speculates that Teruto must be very skilled at Build-Divide and requests a battle with him. She has been searching for a powerful player who can help her win the Reconstruction Battles, allowing her to challenge the King. However, Teruto has lost all his memories ...