Koi ni Naru ni wa Yayakoshii

A student named Chikage acts on behalf of his twin sister, Tsuzumi, by asking Issei, a popular and high-achieving student, out on a date. Chikage's goal is to have Issei reject Tsuzumi, but to his surprise, Issei agrees. Annoyed, Chikage continues the charade, pretending to be Tsuzumi while dating Issei. As time passes, Chikage begins to understand more about Issei's personality and slowly becomes more open around him. Eventually, Chikage uncovers the real reason behind Issei's initial acceptance of the date.