Sugar*Soldier

Sugar Soldier (シュガー＊ソルジャー, Shugā Sorujā) is a Japanese manga series by Mayu Sakai, that was serialized in Shueisha's shōjo manga magazine Ribon from September 2011 to August 2015. An anime adaptation aired from January 14 to January 28, 2014.

Plot
Makoto Kisaragi is determined to step out of her model sister's shadow and have her own high school debut. But things go unexpectedly awry when she clashes with her classmate, hun Iriya and Makoto's sister, Rika showing up at her school.