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.

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 observe everything he does. At the same time, Saitama is convinced that someone is stalking him.

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 up. Genos then senses a monster at a nearby shopping strip and defeats it. However, this makes him miss one of the sales. Once he reaches the other (closed down) supermarket, Genos bumps into the Dai Fuu Family's No. 2 man and the rival C-Class Pacino Family, headed by Don Pacino. Pacino mistakenly believes Genos is associated with the Dai Fuu Family; he steals the apartment key and kidnaps both men, promising to let them and the keys go once Genos states his case. Once Genos finishes telling his worthless story to the Pacino family, Don Pacino becomes angry with Genos and the family opens fire. Genos easily defeats them and takes his key and the Dai Fuu Family's No. 2 man with him. After explaining his tardiness to Saitama, the pair enjoy some sukiyaki.

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 who suffered a defeat. Man of Matagi had seen such a situation. He is also "formidable enemy" in defeated in the past of the owner ....

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 proving so will coerce Saitama and Genos to study under him, Bang invites Saitama and Genos to his dojo under the pretense of giving them free meat.

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.

Child Emperor investigates the murder of Zombieman.

One Punch Man 2nd Season Commemorative Special

Saitama meets a group of villains in a public restroom who mistake him for their ally, they introduce themselves to Saitama, but when he reveals he's a hero, attempt to defeat him.

Atomic Samurai and Bang go out fishing to a lake. Giant Salamander attacks the lake and Chain'n'toad and Mumen Rider try to stop it but fail, and Chain'n'toad is eaten. They are then saved by Atomic Samurai who kills the monster. Kamikaze and Bang talk about how many young heroes these days don't live to the essence of a "hero", and Bang states the Hero Association and their ranking system is partly to blame.

As Genos and Saitama watch TV, Saitama accidentally knocks Genos out trying to reach his potato chips and Genos wakes up with memory loss.

Saitama brings Genos to a tournament for the fighting video game "Wild Animals" due to the grand prize being five million yen. Several locations all over the country are being used as venues, and the battles take place online.

One stormy night, a monster emerges from a junkyard and begins making its way towards Smelly Lid Prison. Noticing its approach, Puri-Puri Prisoner breaks out of his cell and quickly defeats the monster. However, he damages the prison's electricity in the process, allowing a handful of inmates to escape.

Child Emperor, Zombieman, Superalloy Darkshine, and Metal Bat are dispatched to a forlorn, snowy mountain to hunt down a monster.

An interview featurette starring the voice cast and staff of One Punch Man.

We review what's happened so far before the third season begins.