The book tells the story of a small café in Tokyo featuring a mysterious chair. By sitting in this chair, a person can return to a moment in the past, though specific rules apply: most importantly, the past cannot be changed, and the return journey must conclude before the coffee gets cold. It recounts the stories of four different people attempting to meet someone from their past—whether to speak words left unsaid, say goodbye, or gain clarity on their relationships. Through these stories, the book explores themes of love, regret, loss, forgiveness, and the importance of cherishing the present.
