The Demon Lord Tasogare’s castle is a dark and frightening place, filled to the brim with various monsters. Any soul unfortunate enough to be imprisoned here is sure to be terrified by the horrors within. However, the human princess Aurora Suya Rhys “Syalis” Kaymin is a different case. Rather indifferent to her situation, Syalis worries about one thing and one thing only—sleep. Ever since the demon lord kidnapped her from her kingdom, she has not had a single good night’s rest.
To alleviate her dozen dozing issues, the princess makes do with what she can find in the castle. Whether it be the fur of fluffy demonic teddy bears or the silky, blanket-like bodies of ghost shrouds, everything is but a means to ensure a peaceful slumber. With so many potential materials to craft items that can help her sleep at her disposal, nothing will stop the sleepy princess—not even death.
Idly indulging in baseless paranormal activities with the Occult Club, high schooler Yuuji Itadori spends his days at either the clubroom or the hospital, where he visits his bedridden grandfather. However, this leisurely lifestyle soon takes a turn for the strange when he unknowingly encounters a cursed item. Triggering a chain of supernatural occurrences, Yuuji finds himself suddenly thrust into the world of Curses—dreadful beings formed from human malice and negativity—after swallowing the said item, revealed to be a finger belonging to the demon Sukuna Ryoumen, the “King of Curses.”
Yuuji experiences first-hand the threat these Curses pose to society as he discovers his own newfound powers. Introduced to the Tokyo Metropolitan Jujutsu Technical High School, he begins to walk down a path from which he cannot return—the path of a Jujutsu sorcerer.
Kohachi Inugami, a detective who specializes in the occult, arrives at a remote village in the Japanese countryside, tasked by a hostess at a local inn to investigate a string of incidents involving rotting and mutilated livestock corpses that have been appearing for seemingly no reason. While surveying, Inugami notices a peculiar young boy working in the fields. Evaded by his peers and called “Dorotabou” for his stench, the young farmhand is surprised that anybody would take an interest in him.
Inugami, piqued with curiosity, enlists Dorotabou in helping him with the investigation, despite scorned looks from the villagers. Unbeknownst to Dorotabou, this investigation will reveal a strange new world to him—one of the beast-like entities known as Kemono existing in tandem with humans—along with breathing new purpose into his previously empty life.
Young detective Sonia Summers has been transferred to the outskirts of the port city Libra after stirring up trouble with her superiors. Libra is separated into two sectors—”the Upper”, the center of wealth and politics, and “the Outside”. The Outside is home to crime, corruption, and curious incidents involving monstrosities or youkai. Each case that Sonia works on seems to implicate the involvement of these mysterious creatures.
Sonia crosses paths with three peculiar humanoid youkai — Bem, Bela and Belo — who seek to protect humans and fight against the evil youkai that terrorize them. Living as “Youkai-Ningen,” they are excluded by other youkai for their human-like lifestyles, and rejected and hurt by humans when they reveal their true forms.
Despite the hardships they face, these three Youkai-Ningen secretly live among humans, continuing to pursue their dreams of one day becoming human as well.
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.
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.
When his clan is wiped out by a beautiful demon, young Taikobo finds himself in charge of the mysterious Houshin Project. Its mission: find all immortals living in the human world and seal them away forever. But who do you trust—and whose side are you really on—when you’ve been trained to hunt demons by a demon?
Female college student Aoi inherited her deceased grandfather’s ability to see ayakashi. One day, while Aoi is feeding some ayakashi, a demon appears! He declares that Aoi’s grandfather owed a great debt, and as compensation, Aoi must marry the demon! Aoi refuses, and decides to pay off the debt by working.
High schooler Nanami Momozono has quite a few problems of late, beginning with her absentee father being in such extreme debt that they lose everything. Downtrodden and homeless, she runs into a man being harassed by a dog. After helping him, she explains her situation, and to her surprise, he offers her his home in gratitude. But when she discovers that said home is a rundown shrine, she tries to leave; however, she is caught by two shrine spirits and a fox familiar named Tomoe. They mistake her for the man Nanami rescued—the land god of the shrine, Mikage. Realizing that Mikage must have sent her there as a replacement god, Tomoe leaves abruptly, refusing to serve a human.
Rather than going back to being homeless, Nanami immerses herself in her divine duties. But if she must keep things running smoothly, she will need the help of a certain hot-headed fox. In her fumbling attempt to seek out Tomoe, she lands in trouble and ends up sealing a contract with him. Now the two must traverse the path of godhood together as god and familiar; but it will not be easy, for new threats arise in the form of a youkai who wants to devour the girl, a snake that wants to marry her, and Nanami’s own unexpected feelings for her new familiar.