I randomly stumbled upon this and I'm so happy that I did. I haven't heard of the manga but I'm sure to read it after watching this! First of all the characters and the acting is amazing. I love the concept about receiving a letter from the future because, I'm pretty sure a lot of people have a lot of regrets. The scenery along with the music and acting all flowed really well and went together like a beautiful painting. It has a really nice meaning and definitely wow Naho and her friends are friendship goals.