When Keita frees Whisper, a ghost-like youkai, from 190 years of imprisonment, Whisper pledges to protect Keita from supernatural dangers. Whisper also gives Keita a watch that allows Keita to see other youkai. Together with the twin-tailed cat spirit Jibanyan, they encounter many youkai-related problems and solve them.

Source: ANN

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Side story: Eiga Youkai Watch: Tanjou no Himitsu Da Nyan!
Side story: Eiga Youkai Watch: Enma Daiou to Itsutsu no Monogatari Da Nyan!
Side story: Eiga Youkai Watch: Soratobu Kujira to Double Sekai no Daibouken Da Nyan!
Sequel: Eiga Youkai Watch: Shadow Side - Oni Ou no Fukkatsu
Same setting: Eiga Youkai Watch: Forever Friends
Sequel: Youkai Watch!
Other: Youkai Watch Jam: Youkai Gakuen Y - N to no Souguu
Summary: Eiga Youkai Watch: Keita to Orecchi no Deai Hen da Nyan Wa, Watakushi mo