Haru Kurari

Kuraki, a second-year high-schooler who's passionate about drawing manga just on his own, wants to depict cheerful and enjoyable protagonists in his works, but because of his own reserved nature, Kuraki worries about his characters turning out rather somber and subdued. Then he meets Urara Haruno, bright as the spring and a student at a prestigious all-girls academy. With her as his model, Kuraki dashes off a manga in one go, but it also ends up being read by the very person it's based on...!

(Source: Kodansha, translated)