This movie might be isn't as famous as other Makoto Shinkai's movie, Your Name aka Kimi No Nawa. But this is my first Shinkai's movie, I was in awe with the beauty of the animation, with how small details like shadow and light moves, falling sakura and snow, the scenery looks so realistic.
The plot itself is pretty realistic about first love, the characters life phases since childhood till adult and so on.
As comparison, I just watched a movie (not anime) with similar theme but different plot: Tapestry
Tapestry isn't bad, it's just majority of people's life isn't as dramatic as the movie.
Most of us just like lead character in 5 centimeters per second, fall in love when we were teenager, maybe can't forget our first love, and we just living a plain-boring life with go to school, to uni, and work. That's it. Even when someday we met the one who used to we love so much, but both of our world already changed. We can't help but to move on.