Class Ryujin
Ships of the Line
  • BKS Ryujin (S950N2)
  • BKS Mizuchi (S951N2)
  • BKS Isonade (S952N2)
  • BKS Kappa (S953N2)
  • BKS Wani (S954N2)
  • BKS Ushi-Oni (S955N2)
Unit type Attack Submarine
Manufacturer Republic of Japan
Operator Order of the Black Knights
  • Overall Length: 120 meters
  • Overall Width: 16.2 meters
  • Overall Height: 20.3 meters

Maximum Weight: 6,900 metric tons

Equipment and Design Features
  • Type S90A Multispectral Sensor System
  • Type G90A Gefjun Disturber
  • Type R90A Radient Wave Shield System
  • 8 x Type 176 66cm Torpedo Tubes
  • 40 x Type 179 Missile Launcher
Units Carried
  • 36 x Knightmare Frames

The Ryujin-class attack submarine is a vessel utilized by the Order of the Black Knights in Code Geass Megiddo as their primary naval vessel. The original prototype, Ryujin, is noteworthy for being the Black Knights' original flagship during the Japanese Insurrection.


The original design from the TV series. No changes.


A leftover from the Republic of Japan, the Ryujin-class attack submarine was designed to keep Japanese territorial waters safe and enforced. Compared to Britannian contemporaries at the time of their creation, the Ryujin-class (which is named after the mythological Japanese dragon god that ruled from under the sea) was an innovative design, featuring several technologies that would be past down to next generation submarines from different nations, such as photonic masts in place of traditional perescopes, hydro jet thrusters for great mobility and quieter operation, and at the time the most advanced sonar in existence. For armaments, these submarines were armed with bow mounted torpedo tubes and thirty-six VLS (arranged in four eight-cell launchers) along its back, allowing it to launch a variety of specialty torpedos and cruise missiles, depending on the mission profile.


  • Type 176 66cm Torpedo Tubes
  • Type 179 Missile Launcher

System FeaturesEdit

  • Type S90A Multispectral Sensor System
  • Type G90A Gefjun Disturber
  • Type R90A Radient Wave Shield System


While they had been quite effective in battling the Britannian Navy during the Second Pacific War, these submarines were unable to keep Imperial forces from reaching the Japanese Isles, and within a month the war was over. In order to keep these submarines from falling into Britannian hands, the Japanese underground council of industrialists and plutocrats known as the Kyoto House would secretly move them and other remaining Japanese warships to secret harbors in Okinawa, so that they may be preserved for future action against Britannia.

In 2017, when Kyoto House began funding and supplying weapons to the newly founded Black Knights, one of these submarines, the Ryujin herself, would be among their providings, with Black Knights engineer Rakshata Chawla overseeing its refit with modern technology. Among the various upgrades and significant redesigning of the hull, she would also equip the submarine with one of her key inventions, a Gefjun Disturber, which allowed the submarine to move without being detected by conventional sonar. The Black Knights would utilize the Ryujin as a mobile field base throughout the final months of the Japanese Insurrection, all the way to the Black Rebellion itself.

In the aftermath of the Devastation of Japan, the remaining Ryujin-class submarines would be deployed from Okinawa with several other vessels to transport the survivors from the ruined islands to safety. From that point on, as the Black Knights restored their forces, these submarines would once more see use in patrolling and guarding the Okinawan coast, in case the Britannians were to return. By this point, Rakshata has refitted the subs with Radiant Wave Shields, providing them greater defensive measure against attackers.

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