 If you liked
Dennou Coil
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 ...then you might like
Black★Rock Shooter (OVA)
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- the main two girls in both series both start off start off as enimies but one ends up saving the other in the end.
- While the theme of these anime are different, they both have an aura of mystery where you don't fully understand what is going on until the story is fully unravelled at the very end. This quality is what makes the storytelling of both of them so beautiful.