While chasing a suspect through the snow-covered mountains of Nagano, police inspector Yamato Kansuke is momentarily distracted by a shadow that unexpectedly crosses his path. In that instant, a rifle shot narrowly misses his left eye, triggering a thunderous avalanche. Fast forward ten months, Kansuke, who astonishingly lived through the avalanche, learns of an assault on a researcher at the Nobeyama National Astronomical Observatory.