Frost Crack: Renzoku Sogeki Hannin no Suiri

"Do you know about the serial sniper case happening in Japan?" One day, a man living outside of Japan gets a sudden phone call from a young Japanese police officer, who informs him of a serial murder case involving hunting guns. The overseas man is a former hunter, so the police officer tells him the whole story in detail, asking for his cooperation. The ex-hunter, drawing his conclusions, exposes the criminal's tricks. At first, the police officer rejoices, but before long, he realizes that the truth is still far away. The whole story is told through a phone conversation full of suspense and many characters interweaving. The shocking conclusion awaits. (Source: Kadokawa, translated)