Kako no Anata, Mirai no Kimi

After ten years together, the romance between Sayako and Naohiko has quietly withered. The passion that once defined their relationship has long since faded, leaving them as a couple slowly drifting apart. Just as their bond seems beyond repair, Sayako stumbles upon an impossible anomaly: a mysterious staircase appearing in the middle of the street that she has never seen before. Compelled to climb it, she is unexpectedly transported a full decade into the past. She arrives in a time when Naohiko is still a teenager, living in a reality where her younger self simply does not exist. Stranded in this altered timeline, she finds herself face-to-face with the boy who would eventually become her distant partner. This surreal displacement sets the stage for a deeply unconventional love triangle. Sayako is now caught between two versions of the same man—the emotionally detached adult she has spent ten years with, and the vibrant teenager he used to be. As she navigates this strange temporal divide, she must confront the fragile nature of their bond and the lingering echoes of a love that time itself has fractured.