A collaboration between “Touken Ranbu ONLINE” and “Special Edition: Castle EXPO in Kumamoto 2026” will take place over two days, October 3 and 4, 2026, at Kumamoto Castle Hall. The event will feature panel displays and photo spots showcasing six Tōken Danshi associated with Kumamoto—including Kasen Kanesada and Hotarumaru—as well as a stage performance by “Okkii Konnosuke” on October 3 and the sale of collaboration merchandise, with a portion of the proceeds going toward disaster relief.