Heisei Inu Monogatari Bow Movie

Anime that are set either partially or entirely in the era before the written word exists.
-exception: Dr. Stone is too aesthetically similar to other shows in the stack.
-anime with dinous counts until someone create stack about Mesozoic era.
Feel free to refer me to an anime ad, miss. o(*^▽^*)┛

Thanks to user Featherycrimes for mentioning Heart and Yummie.