Urushiha Sarara wa Koi Nado Shinai

The story centers on Sarara Urushiha, who is a beautiful, popular, smart, athletic girl who constantly receives romantic confessions. As a result, all romance has lost its luster for her. One day, annoyed at the constant attention she gets, she relieves her stress violently in an empty classroom, but her classmate witnesses her outburst.

(Source: Anime News Network)