 If you liked
Dennou Coil
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 ...then you might like
Dennou Boukenki Webdiver
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In both anime, the world has gone computerized and virtual; and children spend their time in the virtual world. Additionally, the kids are being attacked by a thing that is supposed to protect them: in Dennou Coil, it's Sacchi; and in Dennou Boukenki, it's the Web Knights.