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 yōkai. Together with the twin-tailed cat spirit Jibanyan, they encounter lots of youkai-related problems and solve them.
Source: ANN. Will be replaced by a unique synopsis written by Anime-Planet and updated tags.
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