''Multi-purpose recon seaplane "Zuiun" that is capable of performing sudden dive-bombing attacks. <br> The 631st Navy Air Force utilized as a submarine-launched seaplane group to operate the expensive, high-performance attack aircraft "Seiran". This "Zuiun" was used by the 631st Navy Air Group for training. | ''Multi-purpose recon seaplane "Zuiun" that is capable of performing sudden dive-bombing attacks. <br> The 631st Navy Air Force utilized as a submarine-launched seaplane group to operate the expensive, high-performance attack aircraft "Seiran". This "Zuiun" was used by the 631st Navy Air Group for training. |