Neo Kyoto is a city with an AR infrastructure and ruled by the King but is also a world where the social and economic status of a person is determined solely by their skills in a game called Build-Divide. One day, Teruto Kurabe is wandering around 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. Witnessing his powers, Sakura speculates that Teruto must be highly skilled in Build-Divide and requests a battle with him. She has been searching for a powerful player that could help her win through the Rebuild Battles, which would allow her to challenge the King. However, Teruto has lost all his memories…

Teruto's battle against Kikka continues, but will he be able to win? Teruto has reached the end of his path, but will he be able to save the people he cares about?

Three years have passed since the collapse of Neo Kyoto. The city has changed completely, and the King's messengers, called KUGE, are spreading throughout the city. In the midst of all this, a girl runs away from the KUGE. Even as she is attacked, she does not fight back. However, until three years ago, she was considered the strongest girl in Neo Kyoto... The girl has been driven into a corner, desperate without escape. There, another girl appears, this one wearing a hood. She says, “It's been three years... I finally found you." She holds out her hand toward the girl. She is Hiyori, Teruto's apprentice.