When the manga moved from weekly to monthly serialization in 2009, Hoshino heard concerns from readers about its possible cancellation and reassured them that the series would continue. She set up Kanda's backstory by introducing the Third Exorcists, characters related to him and Alma Karma. In Hoshino's original drafts, Kanda's past had a number of plot holes. A rewritten, published version had a young Kanda walking along a path surrounded by dead people who had cared for him. Due to its violence, the image was replaced with one in which Kanda learns that Alma Karma had killed them all. When the chapters were collected into a volume, Hoshino added a small chapter which included the corpses.