Kaichigo (貝児 Kaichigo, lit. Shell Kid) is a tsukumogami of a Kaioke, a bucket for clamshells.
Shōsetsu Gegege no Kitarō ~Shu no Oto~
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The Kaichigo is a tsukumogami of a kaioke, or box for clamshells, taking on the form of a small, doll-like boy wearing a kimono. It is considered as a brother of the Hōko.