Ichinomiya Kantarou grew up with the ability to see demons, but was isolated and bullied by others who did not share the same gift. Instead, he became being friends with the demons, gaining a great attachment to their existence. One day, Kantarou was told about the strongest demon, the one known as the ogre-eating Tengu. Amazed by the news of his strength, Kantarou vowed to find this demon who was far stronger than any other, deciding to call him Haruka when he did so. Since this time, Kantarou searched far and wide for the ogre-eating Tengu with no luck, making his living by becoming a folklore writer and demon-buster. On a particular job, Kantarou had finally found news of a nearby shrine supposedly the place where the ogre-eating Tengu was sealed.

Hazuki Kagimura is a socially awkward girl with no friends; and having been recently adopted, she struggles to connect with her new family as well. Her only refuge from this painful reality is between the pages of stories where her vivid imagination allows her to live out her dreams of friendship and adventure. However, one day, an old and mysterious text appears in her book bag. On her way back to the library to return it, Hazuki sees a familiar girl who is seemingly invisible to everyone but her. Deciding to follow her, Hazuki is led a hidden library where a world she thought only existed in her dreams awaits her. 

Märchen Mädchen tells the story of Hazuki's meeting with Shizuka Tsuchimikado, her very first friend, and discovering she has been chosen by the original print of Cinderella to become a powerful mage known as an Origin Master. Hazuki enrolls at Kuzunoha Girl's Magic Academy where she learns to conquer her fears and believe in her ability to create her own amazing story.

He Wan, the leader of the Hidden Clan feared by all three realms, suddenly attacked the Heavenly Palace. The Supreme God Nan Ze came to fight. In order to protect Nan Ze, the jade-growing fairy Yu Zhiyao risked her life to save him. When she and He Wan were about to perish together, she was unexpectedly reborn. By mistake, Yu Zhiyao was reborn into He Wan's body. After the rebirth, He Wan's Hidden Power was greatly damaged. Ting Zhao, the Hidden Guard of the West Sea, came to help the leader He Wan recover her Hidden Power. Since then, Zhiyao was forced to embark on the road of a two-faced female leader, pretending to be majestic in front of others and being charming in front of the king...