Teacher and Stray Cat (2015)

Following the death of his wife professor Kyoichi leads a solitary life by the sea. A stray cat called Mii, who was being fed by his wife, not only continues to drop by, but also seems to be visiting the altar Kyoichi has set up for his deceased wife. While uncomfortable with the cat and its visits, he nonetheless takes up a search when Mii goes missing. The endeavour connects him with the town's folk and reveals that he is not alone.

Unfortunately the movie Teacher and Stray Cat is not yet available on HBO Max.