 If you liked
So Ra No Wo To
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 ...then you might like
Sword Art Online
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-the first arc of Sao is very similar to Sora no wo to because both are a slice of life, what do i mean by slice of life? well you can watch the first episodes and the last ones and you will probably have no plot holes.
- Both are unique episodic anime, but Sao is oriented on trying to be a Shounen or an action show, while Sora no wo to its military themed.
differences
SAO feels a little rushed and Sora no wo to is slowly placed