Jigokudou Reikai Tsuushin
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Tetsushi Kanamori, Ryouji Niijima, and Yuusuke Shiina may only be elementary schoolers, but they're known all over town as the Three Prank Kings, and they even make middle schoolers nervous. When a chance encounter sends them in to the creepy neighborhood shop nicknamed 'the Hell Hall,' staffed by a man who looks like a hundred year old witch and his cat with a human laugh, they get more than the aspirin they came for. Taking tips from information the old man gleaned from his crystal ball, they solve mysteries and work with the supernatural in ways that would scare any reasonable person senseless, let alone a school kid.
An OVA based on the series was released in 1996. [polm23]