Ultraman S01E15 - Kanegon's Cocoon

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.