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.
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Official Release:
- English Asia release by Shogakukan Asia - Singapore
- English North America release by Viz Media
- Indonesian release by Elex Media
- Spanish release by Norma Editorial
- Latin-American release by Panini
