Kimi wa Sanchoume no Tsuki

A young woman receives a mysterious letter from her future self, warning her of an impending disaster. She begins to experience strange occurrences and encounters a quiet visitor who seems to know more than they let on. As she navigates these unsettling events, she also becomes involved with a Christmas-themed organization that plays a role in the unfolding mystery. The story explores her attempts to understand these strange connections and prevent the fate outlined in the letter.