I rarely watch/enjoy romance movies, but this one has actually touched my heart.
The plot is simple but extremely well executed. The development between the 2 main characters is incredible. The visuals are really diverse and beautiful, going from urban cities like Tokyo, to Ocean and Snowy mountains. The acting is also very realistic, you feel all emotions, especially sadness. In addition, the sound track is wonderful since it was done by Radwimps (Your name-Suzume-Weathering With You etc.)
Highly recommend it. If you liked the anime movie : I Want to Eat Your Pancreas, you will truly ~enjoy this one as well.