» Media Appearances
Debut (Light Novel) Volume 13
» Technical Specifications
Classification Multirole Fighter
» History
Affiliation/s Legitimacy Kingdom
Status Active

The S/G-31 is a multirole fighter used by the Legitimacy Kingdom.[1]


The S/G-31 has the same basic frame as the Harpuiai.[2]


The S/G-31 is a multirole delta wing fighter capable of VTOL. It is the Legitimacy Kingdom copy of the Faith Organization's Harpuiai (who was designed by one of their engineers who defected), though it has been updated with a second seat and lacks the advanced pilot equipment of the original, instead choosing to use an outdated oxygen mask.[2]


  • Class: Multirole Fighter
  • Height: 5.5m
  • Length: 17.1m
  • Width: 13.1m
  • Weight: 25.5t (Full weapon load)
  • Propulsion Engine: Premium Heavy Industries, Ltd. Chariot × 1 (VTOL variable thrust model)
  • Top Speed: 2550km/h (With use of afterburners)
  • Armament: Short-range air-to-air missile x 12, 20mm machine gun x 1, deception weapons, etc
  • Crew: Up to 2 pilots
  • Main Color: Gray


The S/G-31 is a copy of the Faith Organization's Harpuiai, a fighter that was designed by an engineer who defected due to a patent issue over the shape of the jet engine's vector thrust nozzle paddle.[3]


Girl's Fight at an Altitude of 10,000mEdit

Mariydi Whitewitch and Nancy Jolly-Roger stole an S/G-31 from a Legitimacy Kingdom airbase to escape from the "zombies" created using molecular motors. After they stole it they were chased by four S-36s, who thought that they were Legitimacy Kingdom soldiers who were defecting. Mariydi engaged the interceptor squadron in air combat and shot 3 of them down. The last of the S-36s was shot down by Mariydi's Ice Squadron. The stolen S/G-31 would later be shot down by the Ice Squadron (with Mariydi's approval) to trick their superiors and allow the squadron to continue their investigation from inside.[2]


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