This movie is a hard watch, especially if you're a parent.
It's not a Horror genre movie, there's no mysterious disease - it's about horrors of parents having to endure watching their child's health deteriorate before their eyes, the heavy toll it takes on them and seemingly endless sequences of medical procedures.
The movie's tone is very serious, it doesn't let go.... It's superbly directed, executed and performed, but the real star of the movie is the lil' girl that played Masako.
It's not an up-beat movie, after watching it, you'll feel exhausted and emotionally drained like the couple in the movie get; ; Highly recommended !!