Twenty-year-old Aihara Minoru has arrived in Tokyo to realize his dream of becoming an action manga artist. To his surprise, he secures a position as a live-in assistant to his favorite mangaka, Takakura Kenji, who writes the popular fighting manga "Ultimate Banchou." However, upon arriving at his new workplace, he finds that his idol is not the tough guy he had always imagined. The reality is that Takakura Kenji is the pen name of Sekai Ichiko, a girl his age who is essentially a moe character (she looks and acts like a little kid). After Aihara's obvious disappointment starts them off on the wrong foot, it will be difficult for him to prove to her that he has what it takes to be a manga artist!