Tokyo Wakusei Planetokio

Sometime in the future, the Tokyo Metropolis was destroyed in an enormous earthquake. It was subsequently rebuilt, with each constituent city constructed as a floating island, connected by flying trains and cars. However, the peace of Tokyo is threatened once more by an alien invasion. Dr. Hokin, who leads the Planetokio Defense Force from a hidden base inside a ramen shop, sends his pupil Iken to exterminate the alien threat using his specially-developed anti-alien ray gun "Narunaru MK1". Tokyo...