Ore no Kanojo wa Uchuu Ichi Kawaii

From : "The person I love is in love with a 2D object-" Kokoa, a girl with a romance level of zero, likes the most popular boy in her class, Soushi. However, Soushi is currently a light novel author in high school, and he's a pure, bright, otaku boy..!? Includes an extra chapter 2.5