Kageki Shoujo!!

Synopsis

Sarasa gets chosen to be the substitute for the Spring Troupe's relay race, under the leadership of its top star, Shiina. This earned Sarasa more envy, especially among the second-years; and became the target of Hijiri Nojima's bullying, which sent her nervous going into the Sports Festival event--it scared her so much that she didn't play the recorder at all during their presentation. It went to near out-of-control when Risa had to intervene and give her a pep talk. By sheer coincidence, Sei Satomi, the lead of the Winter Troupe, enters the scene and gave her a pep talk, too. She is also there to give Sarasa a bouquet of red roses, saying it's "from her fan of the red rose." For some reason, Kouzaburou managed to infiltrate the backstage and "shoved" the bouquet onto Sei, and left the area to the outside of the sports arena (with Akiya waiting). That, along with a few words from Ai--to be her ideal self, put her back to condition. As per Ai's words, she wore fake boobs because she's playing her ideal self during the relay race--Sarasa's "ideal self" being having an E-cup. She trips when Sei fumbles in receiving the baton and crashed into Sarasa. They come in third and fourth, but the two cross the finish line hand-in-hand to hand their batons to the next runners. Sei indeed sees something special in Sarasa, agreeing with Andou-sensei. Meanwhile, Akiha reveals the reason why she chose Sarasa as the substitute runner--a sort-of thanks for standing for one of friends, and because of her fondness for the role of Lady Oscar, which she played ten years ago, without her knowing it was her who played the role. The Sports Festival, held every ten years, ended successfully.

(Source: Wikipedia)