Youkai Watch: Shadow Side is a tV series anime that premiered in spring 2018, produced by OLM.

About the production: the story comes from a video game, there are 49 episodes of about 24 minutes and its current status is "finished".

Its main genres are comedy and supernatural, with themes such as Youkai and Kids.

On AniList, Youkai Watch: Shadow Side has an average score of 65%, a good score, and appears on 1,590 users' lists.

The franchise continues in or follows from: Youkai Watch: Shadowside - Oni-ou no Fukkatsu and Youkai Watch ♪.

Keisuke is a fifth grader who does not believe in ghosts, UFOs, or even youkai. Lately, he has noticed that Natsume has been coming home late, and one day decides to tail her. When he discovers that Natsume goes to a youkai detective agency, Natsume is forced to involve Keisuke in her activities. (Source: Anime News Network)

Official synopsis from AniList.