S.A Vol. 1 (manga)
Being No. 2 Sucks!
Her whole life, Hikari Hanazono has been consumed with the desire to win against her school rival, Kei Takishima--at anything. He always comes out on top no matter what he does, and Hikari is determined to do whatever it takes to beat this guy...somehow!
At age 6 Hikari lost to Kei in an impromptu wrestling match. Now, at 15, Hikari joins "Special A," a group of the top seven students at a private academy, for the opportunity to trounce the guy who made her suffer her first defeat.