Tsukina is a senior in high school preparing for the entrance exam. She has been spending her days with a secret that she can't tell anyone. One day, she meets a mysterious man named SATO at her part-time job. Tsukina is surprised when he tells her his secret. This new encounter changes Tsukina's life. Who am I? What is the answer to the question born in her heart? The circle of destiny begins to turn. A coming-of-age fantasy begins!