Summertime.
This one is definitely an interesting one, quite dystopian. In the future, the elderly seem to live an infinite years while the younger ones are struggling with various ailments. Japan is isolated from the rest of the world. Yoshiro is caring for his great-grandson, Mumei.
As we follow Yoshiro, we see how lots of things have changed. I think it‘s an interesting concept of what might happen in the future, although, the story was melancholic.