An Edo-era inventor, Kiteretsusai, failed to experiment with a time machine and summoned dinosaurs from the Jurassic period to Edo! Kiteretsusai built a giant robot to capture the dinosaur, but it was kidnapped by villains calling themselves the "Black Ship Alien Army! Korosuke sets out to rescue Kiteretsusai and capture the dinosaur! It's the beginning of a great adventure!