Government Spies Nanao shuts down an evil laboratory and swallows the deadly virus they created so his superhuman stomach can destroy it. As this will leave him unconscious for three hours, he calls Taiyo to assist him. At the lab, Taiyo encounters Hinagiku government spies Sui Aoi and Oga Inugami. At first they work together until Taiyo learns their plan to destroy the virus involves killing Nanao. Without hesitating, Sui cuts Taiyo down with a highly skilled sword move but Nanao finally awakens with proof his stomach eliminated all the virus...