Nihon ga Koisuru Haiyuu ni wa Himitsu ga Aru

One day, Kotoha, a sheltered high school girl, meets a guy named Ran, an art student on the verge of repeating a year. By chance, Kotoha visits Ran's atelier. This is a coming-of-age drama set in an art college.

(Source: Natalie.mu, translated)