I was expecting this to be overtly saccharine, but it really wasn't. This is essentially the dark, grown up version of Toy Story - still containing a childlike innocence, but with a much darker and mature take on "the lost toy" tale.
I will admit that the first two episodes, until the end of episode two, starts off extremely slow and can come off as a bit boring. However it is totally worth it for the final two episodes as it builds up nicely, with a heartbreaking and heartwarming conclusion that absolutely tore me apart.
There were a few twists here and there that I was not expecting, which I really admired for their boldness. The whole series really about the light and dark side of grieving. How it can tear some people apart completely and helps other to grow and carry on.
If you've ever lost a loved one, this will definitely hurt, but in a good way.