Killer Motel (2012)

There is a Japanese style inn located in an out-of-the-way area near Mount Fuji. No one knows if it's in business or not, but the inn is owned by two people: the expressionless host, and his bewitching daughter. The host lures six patrons to stay at his inn for one night. All the guests feel the inn has an odd feel to it, but none of them pays attention to it in particular. In reality, the host and his daughter have a hidden agenda. They are hunting in order to feed the host's son: a huge living zombie hidden away in a locked room, whom these cruel hunters dote on as if he were still part of the family. A twisted tale illustrating conflicts of consciousness, cold-blooded insanity, and the depths one will sink to for the love of one's family is about to begin...

Unfortunately the movie Killer Motel is not yet available on HBO Max.