Tetsuo Takahashi is a teacher working at Shibasaki High School and specializing in the physiological studies of demi-humans. His students include Hikari Takanashi, a vampire and lover of tomato juice; Kyōko Machi, a dullahan; and Yuki Kusakabe, a yuki-onna. The school also employs math teacher Sakie Satō, a succubus.
(AKA Kono Subarashii Sekai ni Shukufuku o!) Kazuma Satō is a hikikomori (shut-in) die-hard fan of games, anime, and manga. A traffic accident brings his disappointingly brief life to an end, or it should have, but he wakes up and sees a beautiful girl who introduces herself as a goddess. She asks him if he'd like to go to another world but he can only bring one thing with him. Kazumi chooses to bring the goddess. With that, he is transported to another world and his great adventure subjugating the demon king begins, but first the hard work of finding food, clothing, and shelter begins. Kazuma wants to live in peace, but the goddess raises one problem after another, and then the demon king's army has its eyes set on him.
During the Hundred Year's War between England and France in the Middle Ages, a powerful witch named Maria lives in a secret forest with her familiars. She hates the war around her, and will sometimes stir up trouble against the church that does nothing to stop it. Her interventions into the world, however, run against the plans of heaven, earning her the attention of the Archangel Michael.
Mistarcia is a magical world where humans, gods, and demons mingle together. In the past, the black-and-silver winged Bahamut has threatened to destroy the land, but humans, gods, and demons overcame their differences to fight together and seal its power. The key to that seal was split in two, one half given to the gods and the other to demons, so that they would never be united and Bahamut never released. Now, two thousand years later, the world is in an era of peace - until the day a woman steals the gods' half of the key.
Due to poor grades, Tsukune Aono, an average high school student, has been unable to get accepted into any private academy of his choice. By exceptional accident, the only school to accept him turns out to be anything but ordinary; the school is attended by youkai disguised as humans. Fearing for his life, he attempts to escape only to meet Moka Akashiya, a beautiful girl who just happens to be a vampire. Despite this, Tsukune decides to stay at the academy, hiding his human nature from students and teachers. Tsukune also discovers that when the rosary around Moka's neck is removed, her true nature emerges.
A new semester has arrived for Tsukune and the gang featuring a handfull of girl obsessed female first years and it seems like among these first years emerges another vampire who holds a grudge against her sister Moka. What shall this grudge lead to in the future and shall Tsukune suceed in taming this new problem child into his friend, no one knows what the future holds.
Basara Tojo met his two cute little sisters, Mio Naruse and Maria Naruse. The two sisters revealed themselves as a member of the demon clan and Basara as a member of hero clan, demon clan's enemy, and is not related by family. Mio is the future Demon Lord and since Mio's power is not fully awakened, Basara will protect her from the demons who are after the power she inherited from her deceased father, Demon Lord Wilbert.
While Basara, Mio, and Yuki have picked up their seemingly ordinary lives, they were attacked by magic-wielding humans when preparing for the upcoming sports event. Basara tries to become stronger by strengthening the testament when Rukia, Maria's sister, suddenly appears. Unknowingly, the war deciding the future of the demon realm has started.