The art/animation in this movie is top-notch. Production I.G. with assistance from P.A. Works, Studio Pierrot, and CG by Dandelion resulted in stunning visual quality down to the tiniest details. What I especially liked, was the amount of attention paid to body language and gestures. There's so much information to be gleaned from visuals alone, and that's what I find most interesting about Japanese films. There was also this action sequence near the end that just blew me away. I don't want to spoil, but I have not seen such breathtaking hand-drawn animation since watching "Tonari no Totoro" in the late '80s.
The story begins with the protagonist, Momo, moving to a small fictional island named Shiojima with her mother. Their new house appears to be haunted, and she feels absolutely miserable about moving out of Tokyo. Being a city girl that she is, Momo struggles to adjust to the country life. Instead of playing with the local kids, she eventually befriends three Youkai in her house - Iwa, Kawa, and Mame. Momo begins to appreciate the life on the island, and come to realize the meaning of his late father's unfinished letter to her.
The character development in this movie is absolutely phenomenal. It begins with a light comedy, but through numerous adventures and mishaps on the island, we slowly learn about her past. The transition from comedy to drama is seamless, and it really makes you to care about the protagonist by the end... This film has what I call magic, something Ghibli films of late desperately lack. Although the local kids were severely underused in this movie, I think the three Youkai were the true supporting cast. Their chemistry with the protagonist was excellent, and the humor just comes naturally. Mame's character was especially funny in a quirky way. One can easily tell how much thought and planning has been put into this film just by watching the impeccable timing at which Mame's character was used as comedic relief every single time.
Every piece of music appears to be fully orchestrated, especially the violins stood out to build tension in action scenes. Momo's voice acting by child actress and seiyuu Miyama Karen was a perfect fit, as well as the three Youkai.
"A Letter to Momo" is almost like a homage to Studio Ghibli's kids movies - "My Neighbor Totoro", "Spirited Away", and "Ponyo". It sticks to the tried and tested formula of supernatural spirits that only interacts with kids, and somewhat predictable plot development. However, the producers have managed to merge various elements from all those films into an exciting original story. "A Letter to Momo" is a magical crowd- pleaser with great pacing and a heartwarming story. It's a solid movie that anime and movie fans should not miss.
Possibly the best all-ages anime movie since "Spirited Away" (2001).
