A 39-page oneshot titled "In unity there is strength", drawn by Masakazu Katsura, was published in Shueisha's Weekly Young Jump magazine on August 4, 2011. It will also be included in Katsura's Tiger & Bunny illustration book. The oneshot appears to take place around episode 8 and centers on two intertwined storylines: one where the heroes are ordered to work on their group entry poses and another where they work together out of costume to save people trapped in a burning building.

Thanks to a misprint in the oneshot, Barnaby's Hundred Power (ハンドレッドパワー) is instead written as Hunbread Power (ハンドブレッドパワー).