The “Gakuen Idolmaster” Pop-Up Store 2026 ~Gearbeat Concerto~ will be held at all Idolmaster Official Shops from December 24 through January 11, 2027! Thirteen idols wearing retro-style outfits inspired by the steampunk theme will appear in original illustrations, and a total of 12 items—including acrylic stands and plush toys—will be available for purchase.