Gogh Hajimemashita.

Goho Aoshima is an ordinary first-year high school boy with no special qualities. He is plain-looking, athletically inept, and friendless. When he confesses his feelings to a girl, he is promptly rejected, and just when he thinks he has no chance, the man of his dreams appears......! When he joins a painting class to follow the girl he likes, he meets a mysterious ghost who calls himself "Van Gogh"...? (Source: Kadokawa, translated)