Keiko Koshide
About
Yuri's mother who moves into the complex with her family. She helps her husband take care of matters pertaining to the foreign tenants of the housing complex.
(Source: toonami.fandom.com)
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In the finale it is revealed that Keiko is a fanatical follower of the Cthulhu-esque god named Kuzululu. She and her family have been performing the horrific incidents around the housing complex and killing the residents as human sacrifices for their god.
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