As police inspector Yamato Kansuke pursues a certain man in the snowy mountains of Nagano, a shadow suddenly appears in his field of vision. While he's distracted, a rifle bullet fired by someone grazes his left eye and causes an avalanche accompanied by a roar.

Ten months later, Kansuke, having miraculously survived the avalanche, receives a report that a researcher at the Nobeyama National Astronomical Observatory has been attacked.