After coming across 応援「おうえん」in my Wanikani lessons, I decided to look off into this word since it reminded me of the title of this rhythm Elite-Beat-style game --> 押忍！闘え！応援団 「おす！たたかえ！おうえんだん」
An ōendan (応援団?), literally "cheering squad" or "cheering section", is a Japanese sports rallying team similar in purpose to a cheerleading squad in the United States, but relies more on making a lot of noise with taiko drums, blowing horns and other items, waving flags and banners, and yelling through plastic megaphones in support of their sports team than on acrobatic moves (though some ōendan incorporate pom-pom girls). In addition to cheering for their own teams, ōendan have been known to lead fans in cheers which tease and taunt the other team and its fans. This is usually done in the spirit of good competition, but occasional fights have broken out if the taunting gets too heated. Smaller ōendan are sometimes calledōenbu (応援部?) (or "cheering clubs").