Absolute Anime

I saw this cute trailer when I was in Japan, it was a trailer of a movie from Studio Ghibli...
I could read what was in katakana, which was 'Gedo', but I didn't read the kanji part.
I really wanna see this movie, it seems to be so cute... but I didn't read the kanji, so I don't know the entire name! XDD

Can someone help me with this name, please?

Gedo Senki

I'm pretty sure thats the title. I found the name by searching "Gedo trailer" on youtube. So watch some of those trailers to see if it is the right one.