Sagara Masamune is a manga author who isn't very successful, and it appears to be time to conclude his battle manga. To deliver an unexpected ending, he intends to kill off the main heroine, Nina, in a dramatic fashion. While working on his manga, he is mysteriously sucked into the pages. Now he is trapped in the world of his own creation, alongside his protagonists, the exorcists Haru and Nina. He doesn't fully understand what is happening, but he believes that concluding the manga—which involves orchestrating Nina's death—might allow him to return home.