You'll Be My Addictive Poison

Kana moved to Tokyo in the spring to become a university student, but somehow she couldn't fit in with the vibe of the cool city girls around her. Just when she was hoping to live a peaceful, inconspicuous university life, she somehow catches the eye of Kamishiro Setsu, a senior who is immensely popular with the girls on campus. Before she knows it, cruel rumors are spreading that she's "a girl who's after her seniors," and the misunderstandings only deepen...

Unable to bear the situation any longer, Kana blurts out her true feelings, but Kamishiro Setsu, who just so happens to be there, becomes even more interested in her...

Source: Ichijinsha, translated