Collaboration merchandise between “Knives Out” and Don Quijote / Arita will go on sale at participating stores starting at 10:00 a.m. on October 10, 2026. As exclusive 9th-anniversary merchandise available only at Don Quijote and Apita, the collection will feature T-shirts (3 designs total), zip-up hoodies, face towels featuring quotes from the game, and clear file folders with a map design.