The Valley of the Ohju

While walking in the woods, Joh-on slips and falls onto a ledge of a steep cliff. Erin goes out and finds the hurt Joh-on, and decides to stay with him until morning came. While on the ledge, Erin and Joh-on witness a wild Tohda about to eat a baby Ohju. All of a sudden, they see the mother Ohju fly into action to save her baby and eat the Tohda.

Synopsis excerpt via Kitsu.