One day, a boy named Keita came across Whisper, a Yo-kai (fairy in English) looking like a ghost.
Whisper gave him a device called Yokai Watch.
Keita is able to see various kinds of Yo-kai in his town using the watch from this date.
He comes to know that troubles around him are caused by these You-kai.
He sometimes make friends with Yo-kai or sometimes fight with them and solve these troubles.