 If you liked
Konjiki no Gash!!
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 ...then you might like
Juhou Kaikin!! Hyde & Closer
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You saw this coming, didn't you? But it's pretty obvious, both series deal with boys who get this mysterious doll out of nowhere with a good plot behind it, they get into fights, find the cause and fight some more. Although the characters in Gash "grow up" faster then the one's in Hyde and Closer, the characters are pretty much the same, so are the battle's and plots.