Gariben
The gariben (ガリ勉) is Japan’s version of the classic Western “nerd” stereotype. It was originally spelled as 我利勉 (lit. "self-interested endeavorer"). But the term is now spelled partially with katakana as a pun on garigari (ガリガリ), an onomatopoeia for scraping or crunching, which can be translated as "toiling," "cramming" or "grinding" in the context of working really hard on something.
While “nerd” has become synonymous with “geek” in the West, both terms now associated with niche hobbies like comic books and video games, gariben are focused entirely—and obsessively—on academics and studying obsessively, often to the detriment of their social lives and physical health. Given the meritocratic nature of Japan’s education system, it’s unsurprising to find students like this both in fiction and in real life. The term can be used derisively towards someone who's overly intellectual or preoccupied with scholastic achievements, as one might call someone an "egghead" in Anglophone cultures.
Gariben are best recognized not only by their towering piles of textbooks and an endless supply of flash card rings, but thick reading glasses and a concentration-filled expression. They may also wear a hachimaki band while they study, and routinely attend cram school or gifted student programs. They may or may not have been raised by a kyouiku mama.
Relevance to Eyeshield 21
Yukimitsu is a model example of a gariben, raised by his kyouiku mama to study constantly and shun any socializing and activities that aren't directly tied to academics. One spectator even calls him a gariben as he makes his debut during the Shinryuuji Nagas game.
This has taken a noticeable toll on Yukimitsu's long-term physical development, leaving him with scrawny, frail body with poor stamina. Even his efforts to self-improve are consistent with unhealthy gariben habits, as exercizing non-stop and memorizing books full of plays well into the early morning leaves him sleep-deprived.
Yukimitsu also demonstrates more universal nerd traits, such as wearing reading glasses, and always having a textbook or flashcard ring in his hands. His book bag is stuffed with textbooks, dictionaries, and study guides, and he occasionally wears a hachimaki while studying next to tall piles of books.