Road to Hero
A story about Saitama from when he still had hair and his only costume was a track suit. Several shops in Saitama's neighbourhood have gone out of business and the owner of the last one left needs his help.
The Shadow That Snuck Up Too Close
A story set sometime between Mosquito Girl's defeat and Genos showing up to Saitama's apartment. Genos wants to learn the secret to Saitama's power and decides to follow him and to .. show full overview
The Disciple Who Stinks at Storytelling
Saitama gives Genos a key to their apartment and they both mull over items to buy for dinner; however, upon remembering a limited time sale at two separate supermarkets, the pair split .. show full overview
The Overly-Complicated Ninja
After the events of episode 4, Sonic strive to strict training muffled to the mountain, but had spent the days of troubled with nightmares to be a nasty blow to the groin from Saitama .. show full overview
The Excessively Pushy Bang
After the events of episode 7, Bang begins to spy on Saitama and Genos to gauge their abilities. Hopeful that his Water Stream Rock Smashing Fist martial arts is stronger, and that .. show full overview
The Sisters with Too Much Going On
During a coincidental train ride, Genos and Fubuki are put to the test when an anti-Hero Association group plants a bomb on the train. *This OVA is half as long as a regular episode.
The Far Too Impossible Case of Murder
Child Emperor investigates the murder of Zombieman.
One Punch Man 2nd Season Commemorative Special
This extra has no summary.