A collaboration event between the anime “Bocchi the Rock!” and Toshimaen Niwa-no-Yu, titled “Bocchi the Niwa-no-Yu,” will be held from October 1 to November 15, 2026. In addition to receiving a tenugui towel and a rally sheet with the purchase of a collaboration admission ticket, a total of 10 types of collaboration merchandise featuring original illustrations will be available.