The year is 2205

"History Revisionists" began attacking the past to change history. In order to stop them, the Government of the Time appointed the "Saniwa" with protecting history. Saniwa can awaken tsukumogami (tools with spirits), the Touken Danshi. They travel through time and seek to defeat the History Retrograde Army (HRA) who seek to alter history.

―― At Honmaru
The Saniwa and Touken Danshi were enjoying a peaceful life when they were suddenly attacked by the HRA. After a fierce battle, the Touken Danshi managed to overcome the HRA, but the Honmaru was greatly damaged, weakening their military strength. In addition, in the midst of the battle, the Saniwa, who are vital to the Honmaru, disappeared.

By drifting through the time axis, they somehow managed to hide the Saniwa-less Honmaru, but there was nothing else they could do. The fifteen remaining blades used songs as their support as they lived quietly, waiting for the right moment to come.

A beautiful spring with cherry blossoms in bloom. Once again, the HRA stealthily approaches the Honmaru while it is still adrift. But then Konnosuke appears, appointed by the Government of the Time to deliver a mission referred to as a "battle investigation".

With this last hope, Mikazuki Munechika and the other Touken Danshi embark on a lengthy battle.

"Touken Ranbu Warriors, let's begin."

And so the curtain rises on this historical drama taking place in the Sengoku Era.