In 2009, there was a (fictional!) devastating forest fire in northern Japan's Shizuoka Province in which numerous people disappeared without a trace. The medium Yuna lost her entire family and 15 years later sets out to find clues as to what was behind the disaster. By touching her sister's personal belongings, she hopes to uncover the mystery of her disappearance. When she encounters a dead figure in the middle of the wilderness, she loses herself completely in the green of the forest. The beginning of a mystical journey, an attempt by the survivors to finally mourn the dead.

August 2029. A few days after the Datara invasion, only ruins remain of the cities. 80% of the world population does not survive. A few manage to take refuge in the mountains and continue to live in the forest. There, however, they live in constant fear of the Datara, which are getting closer and closer. Is there a way out?