 If you liked
.hack//Sign
|
 ...then you might like
Zettai Shounen
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I think, they both have the same story telling style. Both have a slow, but very good story and character development. Both have some sort of similar characters, who doesn't speak often also when they should talk. Also the character-drawingstyle from Zettai Shonen, although it's not from Sadamoto, reminds me of SIGN, everytime when I see it.