Seiichi Koshide

Yuri's father who moves into the complex with his family, his job is to connect large companies with foreign technical interns. His current assignment has brought him to Kurosaki as a supervisor and consultant for the foreign workers who have arrived to work at Tsurie fisheries.

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In the finale it is revealed that Seichi is a fanatical follower of the Cthulhu-esque god named Kuzululu. He and his family have been performing the horrific incidents around the housing complex and killing the residents as human sacrifices for his god.

(Source: toonami.fandom.com)