It was considered a mystery why Seigo Harano was so strong.
Regarding the incidents involving him at the tennis club and basketball club, that could be still attributed to having overwhelming stamina. However, the fact that he single-handedly defeated the entire karate club by himself had far surpassed what could be explained by having excellent stamina. That was overwhelming strength as if he was a dragon, which was how he obtained the nickname of "Magic-devouring dragon."
Yukari had personally witnessed his astonishing strength at the doujinshi convention… his cosplay "swordfight" had seemed too realistic and amazing. It was obvious that it was out of the ordinary.