Dororo to Hyakkimaru - episode 17 - 26 Jul, 1969

Dororo stumbles across a village where the headman hoards all the food for himself and pretends to be a demon to scare off the other villagers. However the monster Donburibara forces him to eat until his belly swells so it can enter his body through the navel to siphon off all his nourishment. Hyakkimaru arrives and starves the headman until Donburibara leaves, and he follows it to its origin, a giant tortoise. Dororo enlists the help of the villagers, and they help Hyakkimaru kill the demon. As the demon dies, Hyakkimaru recovers his second eye, making it the 28th demon. (Source: Wikipedia)