This is an awesome movie if you go through it like a movie. The story is as realistic as can be, the drama is set right, the setting is great and the time skip of the each small story is acceptable.
The art is very good and it's "recent" drawing style fits this story quite well.
The sound is great, I like the BG theme and the all that stuff. (Too focused on the subs)
Characters are realistic and are deep despite of the short moments they are given. The depth of the characters could be unpacked if it were a 13 episode series or just more than 3.
I enjoyed the setting most, because I like how the story progresses through time.
Overall, I gave it a 9. Definitely watch it, marathon it if you could though I'm sure most of those who are looking into this are gonna watch it altogether.
I love slice of life stories and this one is a total recommend. Hope you like it too!