Year 1176. Time criminals who proclaim themselves as "Historical Revisionists" with the aim to correct the rightful history, form the "History Retrograding Force" and repeatedly go back in time to stage attacks upon Rokugan's history.

To take down the History Retrograding Force, the Elemental Council sends out the Jade Champion, Kuni Daigo to protect all history. Nevertheless, there is no point in just defeating the History Retrograding Force if history is disturbed as well. Therefore only the smallest of troops are sent to protect history and the methods of sending are strictly restricted.

The opposing History Retrograding Force brings in unlimited troops from the future and sends them to the past. It is said that there are 840,000,000 of them. The numbers far suppress all the humans born in Rokugan.

While it seems clear as to whom will be victorious, the Elemental Council has one trump card up its sleeve.

And that is the skill possessced by the Jade Champion - the ability to manifest the hearts of objects. To awaken the thoughts and heart of sleeping items and grant them the power to fight on their own and to wield themselves.

The awakened tsukumogami - born from the crystallization of ancient spirit and techniques of the strongest items, are sent to the past in order to protect history.