River (Junta Yamaguchi)

[ono]

On a calm winter's day, a mountain inn becomes trapped in a time loop.

https://www.imdb.com/title/tt27695005/

Saw this tonight, knowing nothing about it other than a one-sentence synopsis, and that's probably the best way for anyone else interested to approach it.  It was a treat.  Gave Perfect Days a run for its money.  And all else I'll say is what really impressed me is the writing.  It's a great example of how to continuously twist a concept, revealing more and more layers.