Kamikaze/Other Media

The Murder Case that Is Too Impossible
Atomic Samurai, his student Iaian and other S-Class heroes were invited to a hot spring resort, after the Dark Matter Thieves failed invasion. While enjoying himself at the hot spring, he wasn't satisfied that some of the heroes that did not participate in the battle were invited to the resort, but Bang managed to calm down the situation. The next day after the ceremony, the heroes find Zombieman murdered, stabbed in the back by Atomic Samurai's katana. Child Emperor saw him as the primary suspect, but Atomic Samurai had many alibis including Tanktop Master and Sitch, so all suspicions were dropped. While the investigation wasn't progressing, Tatsumaki tried to restrain everyone, until Zombieman suddenly woke up. Zombieman later revealed that Atomic Samurai's katana was floating with green light surrounding it similar to Tatsumaki, when it stabbed him. Zombieman didn't care what happened the night prior and the heroes disbanded.

Going Fishing with Middle-Aged Men
Atomic Samurai goes fishing on a lake with Bang. The two discuss the hero business in their boat as they wait for fish. Mumen Rider and Chain'n'toad soon appear, having chased a monster all the way to the lake. They fight the monster, Giant Salamander, while Bang and Kamikaze continue their conversation through the chaos. Eventually they decide to intervene, Kamikaze kills Giant Salamander and rescues Chain'n'toad while Bang pulls Mumen Rider out of the water with his fishing rod while. Bang then considers telling Kamikaze about Saitama's true strength, but decides to let him find out himself.

Sonic, Becoming Saitama
Kamikaze is summoned to the Hero Association for a mission when he runs across Speed-o'-Sound Sonic disguised as Saitama. Kamikaze questions why Sonic is there and is annoyed at Sonic's attitude. Sonic draws his blade but Kamikaze blocked it with his sword with such speed that Sonic didn't even see the blade being drawn. Tatsumaki berates Sonic and Kamikaze suggests Sonic leave which he does with his smokescreen shuriken.

Kamikaze and Tatsumaki stumbles upon the corpse of Energiser with Saitama nearby. Kamikaze asks what happened and why Saitama is there but Saitama responds with asking who Kamikaze is. Incensed, Kamikaze points out that it is the second time they met today and asks if he killed the monster as it was a powerful mysterious being.

One Punch Man: A Hero Nobody Knows
Atomic Samurai is a playable character in the video game, One Punch Man: A Hero Nobody Knows.