A young journalist is sent to Matsuyama to cover an interesting story about the Russian prisoners of war cemetery. Her colleague has long been interested in this topic and suggests that she go with him to St. Petersburg in search of additional information. It turns out that not everyone is buried in the cemetery because one person managed to escape from the camp and return home. At the same time, Sakura accidentally stumbles upon her great-grandmother Yui's diary, who worked among the…