In Japan, the term "Otaku" refers to someone who is extremely passionate about a particular interest or hobby, causing their life to revolve entirely around it. Higure, being an avid collector of rare chips, has earned this title from his rival Masa, who often uses it as an insult. Despite their differences in interests and goals, both Higure and Masa are vying for the affections of Mariko-sensei. Higure owns a shop selling rare battle chips in town and is assisted by his own Net Navi called Numberman.