Shousetsu no Kamisama

Ichiya Chitani made his debut as a novelist when he was in middle school. His novels received severe criticisms and were not popular. Now, Ichiya is a high school student. His confidence as a writer is shot. One day, an editor proposes that Ichiya collaborate with his classmate Shiina Koyurugi, who is a popular writer, on a novel. The editor wants a novel that can touch the hearts of people around the world.

Ichiya and Shiina have completely different personalities and reside on different levels in terms of popularity as writers, collaborate on a new novel.

(Source: AsianWiki)