Youkai Watch: Shadow Side
Japanese title: 妖怪ウォッチ シャドウサイド
Alternative titles: Yo-kai Watch: Shadowside
Type: TV
Source: Game
Episodes: 49
Status: Finished Airing
Aired: Apr 13, 2018 to Mar 29, 2019
Broadcast: Fridays at 18:25 (JST)
Duration: 24 min per ep
Rating: G - All Ages
Studios: OLM
Producers: TV Tokyo
Genres: Comedy, Supernatural
Themes: Mythology
Demographics: Kids

Taking place after the events of the fourth film, the series centers on 11 yr old Keisuke Amano, Natsume's younger brother (both of whom are the children of Keita Amano and Fumika Kodama of the original Youkai Watch anime) who doesn't believe in any supernatural phenomenon around him. But as he notices his sister is frequently comes back home late, he decided to stalk her, only to find out she is doing her duties exorcising evil Youkai alongside her friends Touma and Akinori, and running a Yo-Kai detective agency. With their secret revealed to him, Natsume decided to let him tag along in her activities as they investigate Youkai crimes and take on evil Youkai to maintain peace all over the city. 

(Source: Wiki)