 If you liked
Bounen no Xamdou
|
 ...then you might like
Suisei no Gargantia
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The main character's peaceful life is changed. He meets a group of people who are in a similar situation and decides to help them out.
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Recommended by AnimeFan500
In both series, there's science fiction themes but more importantly, it involves a main male protagonist whose lives are changed forever after a certain event.
They meet a girl and they help adjust to their new conditions/place in their world as they discover new ideas and learn about the world that they reside in.
Both series' main male protagonist also seems to have strange origins and a mysterious power. It is invaluable as adversaries from both series threatens the lives of others as well as the world that they reside in.