A collaboration café celebrating the release of Volume 6 of Yoshimizu’s manga *My Little Sister Finds Her Brother’s Obsession Annoying* will be held at the Patio de METRO Etica Ikebukuro location from August 25 to September 13, 2026. The event will feature merchandise featuring newly drawn illustrations of the characters in waitress uniforms, as well as a collaboration menu inspired by food items from the manga. Customers who order food will receive a coaster, and for every 3,000 yen spent on merchandise, they will receive a character card.