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Kappa (河童, river-child) is a type of yokai.
The Kappa are amphibious demon water, depicted as green, human-like beings with webbed hands and feet and a turtle-like carapace on their backs.
A Kappa showed up in front of Kuro Sakuragawa and Saki Yumihara during their visit to Kyoto on New Year's Eve. The Kappa frightened after it knew that Kuro is not an ordinary human, but more like a monster. It later ran away.