I've watched a lot of anime in the past 3-4 years, and this anime movie is probably my favourite. There's just something about this anime that I fell in love with, the song was great, at first i thought that the song didn't fit very well, but after about a minute it fit perfectly. This anime movie shows how hard it is to stay in a relationship when really far away from eachother, it got me crying, and i think that this anime is underrated. I would recommend this anime to people that have watched a lot of anime before, but if you want to watch it anyways then you might not notice how good this anime really is.
(this is my opinion, it might get you or your friend into anime, everyone likes different things)