Southern Germany, Rothenburg. Spending summer vacation in that town, known as a medieval jewel box, was a tradition for you's family. The familiar streets from childhood. From secret shortcuts to a hidden base no one else knew about, anywhere became our playground when we were together.

──A small promise we made back then, a few years ago. I wonder if they've forgotten. We keep in touch with regular calls and emails, but our schedules haven't matched up, so I haven't seen my beautiful childhood friend in years. I wonder what they're doing right now. "Okay, take your seats. Listen up, don't make a racket! We have an exchange student joining our class!" Morning homeroom. The teacher's announcement made the classroom buzz with excitement. The teacher called out to the door, "You can come in now!" The moment that figure appeared, the noise grew even louder. Beautiful silver hair, clear blue eyes. A sculpted face scanned the classroom, and their eyes met you's. In that instant, those well-shaped lips curved into a soft smile.