One-Punch Man Episode 5: The Ultimate Master

The episode opens at Hero Association headquarters, where officials discuss upcoming hero certification exams and note that Genos, a person of interest, will participate. At the test site, Saitama and Genos undergo written and physical exams to register as official heroes.

Saitama aces the physical portion, breaking the punching machine, getting his head stuck in the ceiling during a jump, and shattering records across all tests, shocking examiners. Genos finds every part too easy, scoring a perfect 100 points (50 in written, 50 in physical) for an immediate **S-Class** rank. Saitama passes the physical but fails the written test, earning a **C-Class** rank, which disappoints him.

In the locker room, Genos declares himself Saitama's official disciple, thrilled despite his higher rank, while Saitama regrets the arrangement, unsure how to teach since he heroes "for fun." During Saitama's interview, he admits destroying the House of Evolution headquarters.

A **Class A hero named Snek**—who welcomed them earlier but resents Genos outranking him and doubts Saitama's records—ambushes Saitama on his walk home, attacking with martial arts moves. Saitama, lost in thoughts about whether the Association aligns with his hero ideals, effortlessly defeats Snek without much effort or interest.

The next day, newly upgraded Genos spars with Saitama to probe his master's strength, doubting Saitama's simple training regimen hides a deeper secret. Genos unleashes rapid punches, kicks, energy blasts, and "Death Kyan" (fists combined for a powerful strike), but Saitama dodges casually, toys around, and lands unscathed, even creating afterimages. Begging Saitama to go all-out until Genos weakens, Genos realizes the vast power gap when Saitama winds up a serious punch but stops short, ending the bout abruptly for lunch.

At a udon shop, they tackle a "super spicy udon challenge"; Genos wins effortlessly as a cyborg, while Saitama struggles and nearly collapses from the heat. Their contest is interrupted by **Amai Mask**, the top **A-Class hero** (also called Sweet Mask), a handsome idol-like figure who approaches Genos for a private talk, as Saitama watches warily.

The episode closes with Genos moving in with Saitama, arriving with a massive bag, while Saitama only cares if he brought a toothbrush.