Ekimae yokocho no shonen tantei dan

After a group of children stumble across the Iron Cross Army's secret base, they are kidnapped and held captive. Their parents are threatened to keep quiet while Professor Monster and Amazoness set up plans to activate a massive fault line under the city, destroying everything in the vicinity. When Spiderman is approached by a local group of youth detectives for help, he leaps into action and fights to save the children and the inhabitants of the fated city!