Smile Man and many other heroes decided to head to Z-City to investigate the rumored monster of the city after Golden Ball and Spring Mustachio were defeated, but he came to the scene after it was already beaten by Saitama.
Smile Man team up with Butterfly DX, Narcisstoic, Peach Terry, Chain'n'toad and Death Gatling in an attempts to defeat the Hundred-Eyes Octopus, when Flashy Flash unexpectedly shows up. Smile Man wanted for the heroes to coordinate, but Flashy Flash went straightforward for the monster.
After Flashy Flash blinds the Hundred-Eyes Octopus with his attack, the monster began destroying the city. As Smile Man and the other heroes try to retreat, he was saved by Death Gatling from one of the monster's tentacles . Tatsumaki arrives and pulls the monster off of the ground and crushing it into a ball and drops it. Tatsumaki began belittling the heroes and as Flashy Flash tries to defend himself, Smile Man began shouting in fear Tatsumaki would hear it.
He is seen as a part of an ambush against an injured Garou alongside fellow heroes Death Gatling, Stinger, Gun Gun, Shooter, Chain'n'toad, Glasses, and Wild Horn. He is seen attacking Garou with Chain'n'toad from mid-range and collaborating with the other heroes, and injuring Garou. 
However, when Chain'n'toad chains Garou's legs to immobilize him for Smile Man to throw his kendama ball to smash him, Garou quickly redirects the ball toward Chain'n'toad and crush him. After that, Garou then cuts the chain that immobilized him and launches the ball toward Gun Gun with high velocity and successfully knocks Gun Gun unconscious. After Garou defeats Shooter and Wild Horn as well as the fact that Wild Horn was forced to destroy Smile Man's kendama ball redirected at him by Garou, Smile Man states that capturing him alive is not a good idea anymore, which makes Death Gatling agree that they must send him to hell.
When Garou pulls off the tree roots to distract Death Gatling, Smile Man, and Stinger, Garou rushes toward Smile Man and defeats him with a kick to the face. He is later saved from Elder Centipede's rampage by Bang.
- One-Punch Man Anime; Episode 1
- One-Punch Man Manga; Chapter 20, page 34-35
- One-Punch Man Manga; Chapter 60, page 20-26
- One-Punch Man Manga; Chapter 68, page 9-15
- One-Punch Man Manga; Chapter 68, page 16-26
- One-Punch Man Manga; Chapter 68, page 24-37
- One-Punch Man Manga; Chapter 74, page 29
- One-Punch Man Manga; Chapter 81, page 26-32
- One-Punch Man Manga; Chapter 82, page 7-19
- One-Punch Man Manga; Chapter 84, page 57