 If you liked
Wonderful Days
|
 ...then you might like
The Sky Crawlers
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Both set in a not-so-distant reality you don't know much how it came to be. You may enjoy the similar mechanical technology design, although Wonderful Days' sky theme is backgrounded. Both have very good art and music and well placed CGI, one important difference to mention is that while one is focused on developing the characters the other is in reaching the story's climax.