The main difference between the new Sister Demon King's contestant manga and anime was due to some differences in storyline and character development. In the manga, the protagonist, Black Feather Coat, was a young female high school student, while in the anime, Black Feather Coat was set as a graduate student. In addition, the contract between Black Feather Coat and the Demon King in the manga was more detailed, while some of the plots in the anime were simplified. In terms of characters, the characters in the manga were more three-dimensional and voluptuous, including Black Feather Coat's friend, demon king, contestant, and other characters. The characters in anime were relatively simple. Although there were some characters, they were flatter than in manga. In addition, the storyline in the manga was more complicated, including Black Feather Coat's contract with the demon king, his entanglement with his friends, and Black Feather Coat's growth. The anime was relatively simple and mainly revolved around the contract between Black Feather Coat and the Demon King. These differences made comics and anime different in terms of storyline, character setting, and presentation. However, both comics and anime could present a unique story world that was deeply loved by the audience.