Tōkyō no mizubusoku no chōsa ni yori, chichū kara fukusū no ryū no yōna atama ga shutsugen shi, gamu wa chīmuherakuresu o sono seibutsu no shitai no basho made an'nai shinakereba naranai.
The investigation into a water shortage in Tokyo leads to the appearance of multiple dragon-like heads from underground, and Gamu has to guide Team Hercules to the location of creature's body.
