During World War II, the Japanese military established a secret underground laboratory in Tokyo. Three Olympic-level athletes were selected to undergo a process that would turn them into Jinra-go, superhuman armored soldiers. By March 1945, one of the soldiers had been completely transformed into the half man/half machine ultimate soldier called Mikadroid. But American B-29s firebomb the city and, while the two super soldiers manage to escape, Mikadroid and the lab are apparently destroyed. 45 years pass, Tokyo is rebuilt, and old secrets are forgotten. The site is now home to a complex that includes the Discoclub Layla. The disco’s patrons dance late into the night, unaware that a faulty basement generator has reactivated Mikadroid and the cyborg now prowls the basement levels, killing anyone in its path...

Shibuya, Tokyo. Yoichi and Michio are a pair of hoodlums who make their living as bookies at horse races. One day, Yoichi's companion commits a crime, which leads him to become a real yakuza. In this way Yoichi wishes to put an end to his hoodlum days, but on the other hand he has to leave his brother Michio behind...

A woman named Fujiki Asuka arrives as an acquaintance of a sister in law for a day under the bar master Tamura who had guided Yakuza's escaping as a shoji. Tamura who lives on the second floor of the store for the time being the son who wants to work here. A few days later, Tamura finds a handgun from Yuko's baggage and holds a suspicion.