OLM produced the original Yo-kai Watch TV anime.
The original television series was animated by OLM, the Japanese studio known for producing many game-based and family anime projects. It adapted Level-5’s Yo-kai Watch video-game franchise into a comedic television format centered on Nathan Adams, Whisper, Jibanyan, and the supernatural problems caused by mischievous Yo-kai.
The Japanese series began airing in January 2014 and ran for 214 episodes through March 2018. Episodes commonly used several short segments, allowing the show to move between school comedy, urban legends, character sketches, and stories about Nate trying to solve everyday trouble.
OLM continued to be associated with later Yo-kai Watch productions, including the Shadowside series and other follow-up anime. That can create confusion when a question asks specifically about the “original” show: the answer is still OLM, while later entries sometimes list additional production partners such as Magic Bus. Bones, Madhouse, and Toei Animation are prominent anime studios, but they were not the credited studio for the original Yo-kai Watch TV series.