A collaboration between “Gakuen Idolmaster” and the Seibu-Chichibu Station Front Hot Spring “Matsuri no Yu,” titled “Take the Seibu Railway! A Journey Through the Mountain’s Snow-Capped Peaks and Hot Spring Mist,” will be held from October 16 to November 29, 2026. We’ll introduce admission set tickets that come with a tenugui hand towel, collaboration menus featuring Chichibu cuisine inspired by the idols, “Matsuri no Yu” edition merchandise, a digital stamp rally touring Chichibu City, and commemorative Seibu Railway tickets.