There used to be a boy who could control youkai with a mysterious watch. However, he became unable to see youkai when he became an adult. With the boy's duties finished, the watch was buried away in space-time. Then 30 years later, quiet everyday life comes to an end as a fateful day begins with a comet drawing near. The terrible youkai virus Onimaro infects people's malevolent intentions and spreads infinitely. The one chosen by the yo-kai watch is the one who can save humanity from its crisis. The bond between humans and youkai may be recovered with the attainment of a new youkai watch.