Heart is a tyrannosaurus who is found and raised bv a herbivore mother. After learning his true nature as a meat eater, he runs away from home and finds a baby ankylosaurus egg that hatches and thinks Heart is his father. After accidentally naming the baby Yummie - thinking he looked tasty - their love for one another tests the bounds of nature vs. nurture.

Second part of the new Fist of the North Star movie pentalogy presenting the story from Yuria's perspective, spanning from her childhood, including the day she first met Kenshiro.