Legends tell the story of Sacred Guardians called Shalen who tried to protect the lands from 4 beasts from another world by using the power of fire, metal, water, wood and earth. However, the beasts were too powerful even for them until a new power was found - the wind spell. The spirits of the beasts were sealed and peace was restored in the human world. Ever-since, people born with a special mark on their hand become Shalen who should protect everyone in the human world. Lang Ming is a young blind boy who has an exceptional hearing. While he lives with his mother in Xiaoyanggang and tries to make money, his town is attacked by a demon and his mother disappears. Lang is ready to do everything in order to find her so he makes a deal with a strange girl, he later calls Little Goblin. This marks the beginning of an epic adventure which will change Lang Ming's life forever.

The start of Hanae Ashiya's high school career has not been easy—he has spent all of the first week in the infirmary, and his inexplicable condition is only getting worse. The cause of his torment is the mysterious fuzzy creature that has attached itself to him ever since he stumbled upon it the day before school began. As his health continues to decline and the creature grows in size, Hanae comes across a flyer advertising an exorcist who expels youkai. Desperate and with nothing left to lose, he calls the number and is led to the Mononokean, a tea room which suddenly appears next to the infirmary. A morose-sounding man, Haruitsuki Abeno, reluctantly helps Hanae but demands payment afterward. Much to Hanae's dismay, he cannot afford the fee and must become an employee at the Mononokean to work off his debt. And to make things worse, his new boss is actually one of his classmates. If Hanae ever hopes to settle his debt, he must work together with Abeno to guide a variety of dangerous, strange, and interesting youkai back to the Underworld.

Despite being burdened with crippling debt to the morose Haruitsuki Abeno, Hanae Ashiya has come to enjoy his job as an exorcist. His ability to communicate with youkai has given him a sense of responsibility regarding the magical creatures, and he continues to work hard to send them to their true home in the Underworld. As Ashiya’s life finally stabilizes, the youkai threaten to upset it once again. Knowledge of his existence has begun to spread, and not everyone is happy to have a human working for the Mononokean, the interdimensional tea room. But one day, a simple visit to the Underworld draws the attention of those in power, and Ashiya soon learns that not every youkai is willing to go along with Abeno's plans.