My Guilty First Love With Another Girl's Girlfriend

In exchange for my help with your studies, you must let me stay at your house until summer vacation. If I get a failing mark again, my chance to live by myself will be over. I'm forced to go along with the proposal from Tsukasa, the smartest and most beautiful girl in school. But then I saw them. Tsukasa, who often annoys me with her abnormal behavior, is actually in a relationship with another girl.