"Blue Box" x Big Echo: Scene Stills on Display at Akihabara Showa-dori Exit Store, Official Poster Giveaway from October 4
A collaboration between the TV anime "Blue Box" Season 2 and karaoke chain Big Echo runs from September 29 to November 16, 2026. Five stores, including the Akihabara Showa-dori Exit store, display scene stills, and from October 4 to 10 customers who book via the special web page and spend at least 1,000 yen each receive a non-sale official poster.