In Hakodate, a city of sloping streets and old-world charm, sits Café Donna Donna, home to a peculiar urban legend: a single chair in the café allows customers to travel through time. But the rules are as frustrating as they are mysterious. You can only meet people who have visited the café, you cannot change the present, you must stay seated, and your journey lasts only as long as your coffee stays warm. The time-traveling coffee can only be poured by a woman of the Tokita bloodline, aged seven or older. These rules, passed down through generations, are never explained—"because that's the rule"—and they shape every story that unfolds within the café's walls.