A school boy, Mamoru, sees and retrieves a small meteorite, which coincides with another falling into the Libyan Desert. When they begin to emit signals into space, Professor Ichinotani starts to look into the object that fell in Japan, nicknamed Garadama. Then another giant meteorite crashes into the dam reservoir, scattering boats and evaporating the entire lake, and revealing a strange monster.

Some boys gather to trade items, but bulldozers destroy their area. Kaneo finds a cocoon jingling like coins, but his parents say if he only thinks of money, he'll turn into Kanegon, a creature that eats money. The cocoon grows and when he climbs inside, he turns into Kanegon. A Shinto Priestess who tells his friends a bearded old man must do a somersault and land on his head to come back.