Volume 4 of Toyobayashi Sakane’s manga *Futari Bus* is scheduled for release around November 18, 2026, and a promotional event will be held at bookstores nationwide to coincide with the release. For every set purchased—consisting of Volumes 1–3 and the new Volume 4—readers will receive a special panel sticker featuring one of An-chan’s expressions (6 varieties total). Additionally, stores such as Animate and Gamers will offer exclusive Volume 4 illustration bonuses.