Here are a few calm Japanese movie recommendations:
Moe no suzaku (1997) (and other movies directed by Kawase)
The Taste of Tea (2004)
Megane (2007)
Our Little Sister (2015)
Mori, the Artist's Habitat (2018) (I think it hasn't been released on DVD yet)
If you're ok with other countries, I'd also recommend the Taiwanese movie A Summer at Grandpa's (1984).
