Unit Name: R-1 Kai
Model Number: R-1Kai
Height: Unknown
Weight: Unknown
Pilot: Ryuusei Date
Weapons: Head 60mm Vulcan, Cold-Metal Knife, Giant Tonfa Revolver, T-Link Knuckle Kai, Nendou Shoot, Boosted Rifle, and Tenjou Tenga Nendou Hasaiken.

It's a modified version of the R-1. It's not the R-1, but rather a replica that was upgraded.

The SRX's combination sequence was omitted, but it received enhanced close ranged combat abilities, and an increase in performance capabilities in order to compensate for the loss of the combination with the other R units. It also lacks the Uranus System.

This model was to serve as the basis for the mass production models.