Darling (2003)

Jun Kitano is a hentai manga artist who just got married to his long-time assistant Miyuki. One day, a chief editor named Sonoko Mifuji comes to his house and asks him to come up with an entirely new manga in less than a month. Failure to do so will result in the publisher getting his way with Sonoko. Jun decides to take the job, as he and Miyuki have a secret method to complete any manga in record time.