Unit Name: Grungust Kai
Model Number: SRG-01C
Height: 50 Meters
Weight: 285 Tons
Pilot: Irmgard Kazahara
Weapons: Boost Knuckle, Keito Ragouken, Omega Laser, Final Beam, and Kaishiki Bakurenda.

It was developed by Tesla Leicht Institute, and is a remodeled Grungust (Type-1) that features increased armor and strength.

The transformation mechanism has been omitted since this unit is equipped with the Tronium engine which allows it to fly. It also features the Gravicon system, which is also in the Huckebein MK-II.

Although it's a prototype, it exceeds the Grungust (Type-1) series. Its nickname is "black."