 If you liked
Kidou Tenshi Angelic Layer
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 ...then you might like
Robotics;Notes
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Both series incorporates science fiction themes that involves a mechanical unit. The main characters from both series hopes to perfect that unit and show it to the world.
Both series adapts a lighthearted theme that has drama and comedy.
Both series also takes place at a school life setting where the main protagonist makes new friends and faces new obstacles throughout each episode.