Suspicious death under the cold sky. Is this a suicide, or... The second installment of the full-scale mystery adventure series. The mystery adventure "Izumi Jiken File" series is a mystery adventure game that "deduces the culprit" based on the situation at the crime scene and the information collected by interviewing. The best-selling author "Kagamizuki Masamune" who always goes on a sudden trip, and the new editor "Izumi Kido" who is in charge of it. Solving the mystery of the code left by Kagamizuki, this time Izumi arrived at Tempozan in Osaka in winter. But there was another incident there... A man who drank coffee with sleeping pills and froze to death leaving a suicide note under the cold sky with a temperature of -5℃. Just before the estimated time of death, she was suddenly told a breakup story from her who was dating, and there is a motive that led to suicide, but Kagamizuki feels uncomfortable with the victim who is said to have moved to the scene of the discovery of the body without wearing a jacket. Izumi, who took the manuscript hostage again this time, is stubborn as an editor and approaches the truth of the case.