
A three-page bonus chapter tucked into Volume 25, Back of My Head is a small comic vignette about Saitama growing anxious over his thinning hair and fighting a lone mirror to glimpse the crown of his own head.
Roughly a year and a half earlier, Saitama is out in a park grinding through push-ups as part of his usual routine. Once the workout is done he showers and realizes his hair keeps falling out, leaving his scalp feeling more exposed than before.
Curious about the back of his head yet stuck with only a single mirror to work with, Saitama tries whipping his head around quickly in the hope of catching its reflection. He misses again and again at first, though he apparently manages to steal a glimpse of it by the end.

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"Back of My Head" is a short comic vignette about Saitama growing anxious over his thinning hair and struggling to catch a glimpse of the back of his own head using a single mirror.
The chapter opens roughly a year and a half earlier with Saitama grinding through push-ups in a park as part of his usual training routine.
After showering following his workout, Saitama notices his hair keeps falling out, leaving his scalp feeling more exposed than before.
With only a single mirror available, Saitama repeatedly whips his head around trying to catch its reflection, missing several times before finally managing to glimpse it.
"Back of My Head" is a three-page bonus chapter that shipped with Volume 25 of the One Punch Man manga on May 2, 2022.
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