Renai Kyoushuujo

From StarryHeaven: Ran is terrible at love and is always getting rejected. Today’s rejection was witnessed by the most popular prince at school, Takashina-kun! Ran thought she came off as an idiot, but with Takashina supporting her efforts, Ran falls for him! That night Ran left for home late and in a seemingly empty classroom, she encountered a mysterious man in a military uniform. Did Ran discover the love training institute?