This is the best I've watched in the last 5 years, there is a ton of balance in the plot, ZERO inconsistencies. It's really hard not to fall in love with the relationship between Kento and Ana, for they are vulnerable, yet loyal to one another in the highest possible way. The things that happen to them are quite heartbreaking, but in contrast to that the way they react and how cute they are will get to your heart and reaffirm or make you believe in true friendship.
The art is also great. The actions scenes are exciting, I would easily say that this is one of those anime-masterpieces out there. I'll give it a 10 out of 10. WATCH IT if you haven't!!!