Overrated anime has beautiful animation, little else
While the animation was simply beautiful, "Mirai" has a number of extremely noticeable flaws that really prevent it from being as good as it first appears to be, especially gaping plot holes (if the past, present, and/or future versions of people really can't exist at the same time like the titular character says, why is Kun literally talking with what is later revealed to be his teenage self in one scene?), a complete lack of plot structure, and an extremely bratty main character who is inexplicably voiced by an adult woman in the original Japanese dub. Also, for some stupid reason, the film decides to get really "dark" towards the end with a completely pointless jumpscare (some woman who looks like his mom is actually a demon or something...why?) and an extremely creepy train to "Lonely Land"-whatever the heck that is-(this scene is so over-the-top bizarre and nonsensical, it's almost more funny than scary, but still), shutting off the very young audience it might have appealed to otherwise. Why is this the case? Who knows.
Granted, I guess there are some positive messages about "loving your family" or something like that, but even those aren't enough to redeem this film, leaving it best suited for hardcore anime fans or those too bored to care what they put on, just as long as it looks pretty enough. My MPAA rating: PG for some scary moments/images and thematic elements.