As peace returns to the demon realm, Anos Voldigoad wishes nothing more than to put his reputation as the Demon King of Tyranny to rest and go back to being a misfit at the prestigious Demon King Academy. Unfortunately, any tranquility is fleeting: sinister demons, kings, and deities plot Anos's demise from the shadows. Rumors spread about the Child of God, a being whose power may rival that of Anos. To uncover the truth and eliminate the potential threat, Anos must journey deep into the land of spirits. However, the spirit world is shrouded in mystery, and it may only be entered after undergoing a series of difficult trials. With unrivaled power and confidence, Anos braces himself to defeat various formidable enemies with grandiose titles. But he—with the assistance of his trusted allies—will barely have to break a sweat as the true Demon King of Tyranny.

Kouta has girl troubles of the supernatural sort. For some reason, he keeps attracting the attention (and affections) of animal spirits! Having spent most of his life in the country, Kouta is understandably nervous when he moves in with his grandma to attend a high school in the big city. He hoped to make a good impression, but having Chizuru, a beautiful fox spirit, hanging off his arm didn't seem to be the sort of image he wanted to have. She's not alone in her love for Kouta, either. Nozomu, a wolf spirit, as well as other youkai have their sights set on the hapless country boy.

When Origami Tobiichi asks Shidou Itsuka out on a date, Shidou considers this his best opportunity to set the record straight and end their relationship. However, even with the help of the Ratatoskr crew, his attempts to break up with her fail; in fact, Origami gladly tolerates Shidou's humiliating requests and blunt comments! Shidou's unconventional mission incidentally complicates his relationship with Tooka Yatogami, and it seems that easing the tension is only possible by going on another date.

Dressed in a conspicuous outfit and armed with an eccentric spirit, Hina Satou goes around insisting that she is the Asgardian god Odin. When she crosses paths with a boy named Youta Narukami, she uses her precognition abilities to warn him about an impending catastrophe threatening the end of the world. But being a teenager preoccupied with his problems, Youta finds it hard to believe such a preposterous claim. Somehow forced to tag along with her antics, he witnesses the effectiveness of Hina's skills with his own eyes and realizes that she truly is capable of divination. Nevertheless, despite her persistence in being a god, Hina is still a child who desires to see and experience the wonders life has to offer. With the world ending in 30 days, Hina, Youta, and their friends venture forward to create lasting memories they will cherish forever.