Taking place 30 years after the events of the original Youkai Watch TV series. There was once a 11 year old boy named Keita Amano who held a wristwatch that could command Youkai, he would make friends with the Youkai and fulfill a great many deeds. But when the boy grew up, he lost his ability to see Youkai. And as for the wristwatch that could control Youkai, its existence threatened to disturb the balance between human and Youkai worlds, so it was cast away into oblivion beyond time and space. Soon ... the story of the Youkai controlling wristwatch became but a legend. But then, something took place after many, many years had passed ... an epidemic Youkai virus known as Onimaro started affecting people with malevolent intentions and is spreading indefinitely, turning them into Kaodeka Oni and causing chaos throughout the city. With the end near, only the ones chosen by a new Youkai Watch can stand up against the upcoming threat and would save both Youkai and humans from certain destruction. (Source: Wiki)

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)

The movie will feature special guests such as popular familiar characters from the TV anime series and the latest Youkai from the upcoming Youkai Watch 2 sequel games.

Hundreds of years ago, the borders between the worlds of humans and youkai temporarily overlapped, resulting in many residents of both crossing over to the other side. In the years since this event, the city of Sakurashin has become a central hub for all inter-dimensional affairs—a result of both the sacred Seven Pillars around the city serving as a beacon for the youkai, and the efforts of the Hiizumi Life Counseling Office in keeping the townsfolk happy. This office is composed of Hime Yarizakura, the young mayor of the city; satori Ao Nanami, who can read people's minds; half-youkai Kotoha Isone, who can summon anything by speaking a word; oni siblings, Kyousuke and Touka Kishi; and the office director Akina Hiizumi, who inherited his family's ability to force youkai back to their world. Besides volunteer and arbitration work, the Life Counseling Office also suppresses any Strikes: rare occurrences where humans are suddenly infused with youkai powers and go on a rampage. But the appearance of a sinister man signals trouble as Strikes become increasingly common, political rivals make their moves, and malicious individuals descend upon the city. As the self-appointed defenders of Sakurashin, it's up to the Life Counseling Office to protect the idyllic city they call home!