Fourteen-year-old Iruma Suzuki has been unfortunate all his life, having to work to earn money for his irresponsible parents despite being underage. One day, he finds out that his parents sold him to the demon Sullivan. However, Iruma's worries about what will become of him are soon relieved, for Sullivan merely wants a grandchild, pampering him and making him attend the demon school Babyls. At first, Iruma tries to keep a low profile in fear of his peers discovering that he is human. Unfortunately, this ends up being more difficult than he expected. It turns out that Sullivan himself is the chairman of the school, and everyone expects him to become the next Demon King! Iruma immediately finds himself in an outrageous situation when he has to chant a forbidden spell in front of the entire school. With this, Iruma instantly earns a reputation he does not want. Even so, he is bound to be roped into more bizarre circumstances. [Written by MAL Rewrite]

The world is divided into two kingdoms: the Kingdom of White, which floats in the heavens and is ruled by their queen Iris, and the Kingdom of Black, which stands upon desolate land below and houses the King of Darkness as its ruler. As of late, forces of evil have amassed great power, posing a threat to the entire world. Being the main representative of the Light, it is Iris' duty to maintain the balance of the world and fight off the darkness in her kingdom. Meanwhile in the Kingdom of Black, rampaging monsters annihilate a certain boy's village, leaving him the sole survivor. As he grieves in hopelessness, an armored man named Skeer notices the child and comforts him. Soon after, Skeer recognizes the boy's potential to change the kingdom's status quo and makes him his heir before passing away. The boy then vows to become the Prince of Darkness—the one who will replace the King—to bring the world back to its rightful path. As Iris and Prince of Darkness each challenge the impending doom the world faces in their own respective ways, their destinies will converge with each other, and perhaps, their bond will decide the fate of the world. [Written by MAL Rewrite]

Even though they shared the same bus every morning and sat next to each other in class, Ayaka Kagari, the "Princess" of Tougetsu High School, was nothing more than an unreachable idol for Honoka Takamiya. The horde of students who worshipped the "Princess" was merely a nuisance to Honoka, living his lazy, regular high school life. Everything seemed perfectly normal until, one day, Honoka is attacked out of the blue by a mysterious witch. To his surprise, Ayaka saves his life, revealing herself to be a fire witch on a covert mission to protect Honoka. From that fateful day, the ordinary life of Honoka is turned upside down as he is thrown into the war between the Workshop Witches, who strive to protect the citizens, and the Tower Witches, who desire to steal a power hidden within him. [Written by MAL Rewrite]