The Ultimate Master

Kyūkyoku no Shi (究極の師)

Saitama and Genos are finally going to become registered heroes, but first they have to pass a physical and written test in order to prove that they worthy of being a hero. Saitama easily surpasses the physical exam and anyone else that took it. Even though he aces the physical exams, he doesn't do as well on the written part. Saitama passes the test by just 1 point and is given a C rank, while Genos gets a perfect score and is given an S rank.

Saitama and Genos are the only ones who made it out of all the applicants to actually be in a class where Sneck is going to teach the class. Sadly the class A Teacher is too confident in his skills but Genos and Saitama are clearly stronger. Then in class the teacher gets annoyed by Saitama for not paying attention and tries to teach him a lesson, only to embarrass himself. Later that day Genos wants to spar with Saitama because of his newest upgrades.

Genos still doesn't believe Saitama's secret training strategy and thinks there must be some other secret that even Saitama himself might not know. Meanwhile Genos is giving it his all in the spar while Saitama is just messing around, not really caring about the fight. So he asks Saitama to give it his all, and right when he does the fight ends without Saitama even hitting him. Then Genos came to realize that Saitama is on another level that even he himself can't pass by just training.

After the training they visit an udon shop where they had an eating contest where Genos had no problem completing while Saitama nearly passed out. Sweet Mask suddenly came and requested to speak to Genos outside. Sweet Mask came to congratulate Genos and welcomed him to the team, much to Genos' surprise.