200 Yen

The story opens on a twelve-year-old Saitama nodding off through his middle school's opening ceremony. Nearby, two bullies shake down a group of younger kids for cash, and a youthful Mumen Rider, still calling himself the Nameless Bicycle Commuter, tries to intervene. A day later Saitama lounges in bed watching a broadcast about an escaped Mysterious Being, and the morning after that a teacher scolds him over unfinished homework and orders him to report to the staff lounge once classes end.

When the school day is over, the same two thugs, the Ripped Uniforms, corner Saitama, beat him, and make off with 200 yen. The runaway creature Piggy Bancon then appears demanding coins, and the delinquents surrender the stolen money to it.

Hearing one bully lament that he can no longer buy his little brother's lunch, Saitama gives chase after the monster. He catches up, only to be knocked out cold for more than an hour. Waking late, he trudges to the staff lounge and is reprimanded for his tardiness, then leaves school wondering whether he is simply too weak to live properly. The scene jumps to the present, where a grown Saitama walks a snowy slope with a child riding his shoulders and voicing a fear of the future.

This extra ran with Volume 1, released December 4, 2012, and spans twenty-three pages. Saitama reassures the boy that there is no single correct way to live no matter how strong a person becomes, before the child spots a huge snow monster ahead and asks if he can beat it; Saitama instead panics over forgetting to take out the trash. His shirt nods to ONE's other work, Mob Psycho 100, and a voiced version appears on the One-Punch Man Maji Drama CD Vol. 1.