Bishoujo Sakka to Mezasu Million Selleeeeeeeeer!!

The story follows Kiyozumi Kurokawa, a novice editor who is assigned to the editorial department of S ("Sandal"? Bunko, which publishes light novels. Kiyozumi is determined to publish a million-selling hit series, but this task is easier said than done when his writers include a genius high school girl and an office lady whose last two series tanked.

(Source: Einherjar)