
A single-page gag bundled with Volume 15, this bonus chapter answers the question of whether Genos can swim by turning the cyborg into a piece of aquatic hardware, all while Saitama drifts and relaxes out in the open sea before his disciple resurfaces in unexpected form.
Out at the beach, Saitama asks Genos whether he is able to swim. Genos replies that Dr. Kuseno has fitted him with special parts for the task and heads off to get them ready.
Left floating and at ease in the ocean, Saitama grows curious about where his disciple has gone and calls out for him. A periscope suddenly rises and lifts him up, revealing that Genos has transformed into a submarine, and Saitama shouts at him to pull himself together.

Naruto vs Luffy with the twist nobody asked for: Luffy tickled Hinata on date night, and she kind of liked it. We break down the whole fight and commit to a winner....

There are no women on Namek. That isn't an oversight, it's the biology. Why we handed Piccolo the one thing his own species rules out, and why it had to be trap soul....
In "A Hopeless Swimmer's Counterplan," Saitama asks Genos whether he can swim while relaxing at the beach, and Genos leaves to prepare special parts fitted by Dr. Kuseno before resurfacing in an unexpected form.
Genos answers that he can swim because Dr. Kuseno has equipped him with special parts for the task, then transforms into a submarine to prove it in this bonus chapter.
Genos surfaces as a submarine, complete with a periscope that lifts Saitama out of the water, prompting Saitama to shout at him to pull himself together.
"A Hopeless Swimmer's Counterplan" is a one-page bonus chapter bundled with Volume 15 of the One Punch Man manga.
Viz Media localized this bonus chapter's title as "Learning To Swim."
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