20-year-old Minoru Aihara has come to Tokyo to make his dreams of becoming an action manga artist come true. To his amazement, he lands a job as a live-in assistant of his favorite mangaka, Kenji Takakura, who writes a popular fighting manga called "Ultimate Banchou."

Upon arriving at his new workplace, however, he discovers that his idol is not the tough guy he'd always imagined. The truth is, Kenji Takakura is the pen name of Ichiko Sekai, a girl his age who is basically a moe character (she looks and acts like a little kid). After Aihara's obvious disappointment starts them off on the wrong foot, it's going to be tough for him to prove to her that he has what it takes to be a manga artist!