A poisonous atmosphere known as madness settled over Japan, causing mass devastation. Humans, wearing gas masks, hunt and kill monsters transformed by this gas.

The plot follows Kei Kazaoka a high-school sophomore who has an "ultra" computer embedded in his brain. He uses his increased intelligence to help the... more>> 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. <<less