Yuuma’s little step-sister Mayu is better than him in virtually everything, so he has a massive inferiority complex and takes out his frustrations on her. When she gets the top score on the latest test results, it’s the last straw.
Unfortunately, the release is missing a page (15) because the scanner or uploader skipped it, and it’s unlikely it will show up anytime soon. If it’s any consolation, its absence hardly affects the story and may not even be noticed by many people.
Quality checkers: Cadenza, Kurosenai, freudia
[Saemon] Performance Complex (COMIC Sigma Vol. 77) [English] [Team Koinaka]
[サエモン] Performance Complex (COMIC Sigma Vol.77) [英訳]