A test machine for the upcoming sleeker Windom, it was deployed with Yoko as the pilot to bring Red Smogy towards the rampaging Vortex Fire. As Yoko brings the confined monster but needs to catch up due to her time limit, she was forced to pass it to Idatenran, with Haruki scoring the final attack for STORAGE's victory.
- The SC Unit's appearance is an exposed version of Windom's body and a head that combines the aspects of Windom and Sevenger's "eyes".
- Being a test-only mecha, it lacks any offensive weaponries and was used in the last minute when Sevenger was drowned from Vortex Fire's attack.
- Weakness: The SC-2 Prototype Machine can only remain active for 3 minutes.
- Powers and Weapons
- Super Strength: At the very least, the prototype machine is able to lift up a restrained Red Smogy with little trouble.