When she was a child, Benio Hitomi was spirited away and lost all memory of the event. On the eve of the Gion Festival, she finds a Western-style umbrella at Chishakuin Temple—and in that moment, she encounters a beautiful white-haired man she’s never met before. Yet when he says, “You’ve finally come to get me,” an inexplicable sense of nostalgia washes over her. The next day, guided by the same umbrella, Benio arrives at an old antique shop near Kamigamo Shrine called Yurara, where she meets the man again—Mashiro. Suddenly, she’s swept into preparations for a wedding and told of a mysterious engagement from her forgotten past…!?