Onari tries to prove she can defeat the Oni despite not having visible powers yet, while an unexpected guest arrives.

The series is essentially a coming-of-age story centered on the between Onari and Naridon. It explores universal themes like: ONI: Thunder God's Tale TV Review - Common Sense Media

To defend their home, the village children must unlock their a unique inner power passed down through their bloodlines. While her classmates easily find their abilities, Onari struggles because her father, Naridon —a bumbling, lovable, and mute creature—doesn't seem to have any powers to pass on to her. Episode-by-Episode Breakdown

It sounds like you're looking for the plot summary of the Netflix limited series (Season 1). The show is an animated fantasy adventure inspired by Japanese folklore. Story Overview

A major secret about Naridon and Onari’s true nature is revealed, throwing the village into chaos and leading to a climactic confrontation where Onari must choose who she wants to be. Core Themes

What's the Story? In ONI: THUNDER GOD'S TALE, there is an ongoing feud between main character Onari's village and the Oni. Onari ( Common Sense Media Oni: Thunder God's Tale Season 1 Episodes - TV Guide