(General Higurashi Spoilers) I think it was Takano and the Yamainu actually. Takano did ask Keiichi whether he ‘buried the corpse deep enough’, so it’s implied she knows that he buried a corpse. It’s not a stretch to assume the Yamainu dug up the corpse to make Keiichi a less credible witness so he can’t believably testify to having seen Takano.
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