The life of gloomy teenager Akio Heruezia is torn asunder after the unexpected loss of his mother in a house fire. Not soon after he is placed into foster care, he receives a letter from his absentee father, asking to reconnect with him several towns away. Despite loathing the man, Akio decides to venture out to see his last remaining family and tell him personally about his mother's passing. Chaperoned by his new foster brother Shunsuke, Akio's simple trip to the mountains quickly becomes a life or death race against the clock after learning the truth about his father's disappearance and the titular Red Moon that threatens everything they hold dear. A new tapestry of despair is about to be woven in this supernatural urban fantasy series.