Chousuinou Kei - Makafushigi Jiken File

Chousuinou Kei - Makafushigi Jiken File (超推脳 KEI ~摩訶不思議事件ファイル~) is a manga written by Kazuo Gomi and Mitsuhiro Mizuno and illustrated by Yoshiki Tanaka.

Plot
Kei Kazaoka is a high school sophomore who has an "ultra" computer embedded in his brain. He uses his increased intelligence to help the police with weird and mysterious cases, that go beyond the normal bounds of reasoning. Most of these cases are related to the supernatural and magical.