Koi ni Naru ni wa Yayakoshii

The most popular guy at school has his heart set on someone... and it's me?! On behalf of his twin sister, Tsuzumi, Chikage asks Issei out, a popular honor student at his school. Not wanting Issei to date his sister, he approaches him hoping to get rejected. To his shock and dismay, Issei accepts the confession! Furious, Chikage plays along and the two start going out—all while pretending to be Tsuzumi. As their relationship progresses, Chikage learns more about the unexpected sides of Issei, and little by little, he begins to let his guard down around him. Then one day, Chikage discovers the truth behind his confession...! (Source: Leed-sha, translated)