The DVD and Blu-ray volumes of the anime consist of specials that feature original stories crafted by ONE, the mangaka behind the series. Among these specials is "Shinobiyori-sugiru Kage," which takes place after Saitama's encounter with Mosquito Girl. In this episode, Genos actively follows him in an attempt to uncover the secret of his power. Meanwhile, a shadowy figure appears, nursing a grudge against Saitama for a specific reason. Additionally, other specials like "Hanashibeta-sugiru Deishi," "Kojire-sugiru Ninja," "Gouin-sugiru Bang," "Iroiro Ari-sugiru Kyoudai," and "Fukanou-sugiru Satsujin Jiken" are also included.