An incident has been continually occuring where swords and spears are being stolen from museums and art museums. The criminal is Asteroid Yamatoman. He appears in the real world and carries out his objective. Though Netto and Laika follow the incident, they do not know the true identity of the operator. Just at that time Laika's friend Iriya comes to Japan, Laika notices he is strangely in posession of many traditional Japanese arms and begins to suspect him. - Heat Man