Oyajitchi features in the 1997 animated short "Tamagotchi Honto no Hanashi" as a resident of Tamagotchi Planet. He displays his signature mustache and distinctive side tufts of hair, consistent with his franchise appearance. Notably, Oyajitchi speaks Japanese, unlike most other Tamagotchis who communicate through sounds.

His actions ignite the film's central conflict. Oyajitchi decides to share his alcoholic beverage with the living entity of Tamagotchi Planet. This single sip causes the planet to become severely intoxicated. The planet's drunken state manifests as violent earthquakes and extreme environmental instability, transforming the landscape into wavy, unfocused terrain lacking equilibrium. These dangerous conditions force the entire Tamagotchi population to evacuate their home world.

During a subsequent drunken musical performance, the intoxicated planet uses a giant sign as a microphone. This event serves as the catalyst leading to the Tamagotchi species' arrival on Earth, where they are discovered by Professor Banzo.