Shidou Itsuka carries on with his quest for Ratatoskr in finding Spirits and trying to seal their powers, all while maintaining his relationships with the ones he had already sealed. Moreover, as new Spirits appear, he must undergo more complicated trials—all to put a stop to further disasters as he discovers more about the Spirits' origin.

On the surface, Ryousuke Kaga is the token perverted teenager, spending his days ogling women and indulging in erotic reveries. Because of this, Ryousuke is ostracized by his classmates. Only his childhood friend Mina Okura knows that behind his lecherous persona lies a compassionate boy who has sworn to be chivalrous to girls, believing they are treasures that must be protected. One fateful day, Ryousuke runs into Lisara Restall, a Soul Reaper hailing from a noble family, whose primary objective in the human realm is to locate a magically potent person known as the One. In order to fuel her movement with magic, she decides to form a provisional contract with Ryousuke: to use his sexual desires as a source of energy. Carrying out this peculiar arrangement with Lisara, Ryousuke encounters many disparate individuals but also learns of the intriguing yet dark secrets surrounding his world.

For high school student Tanaka, the act of being listless is a way of life. Known for his inattentiveness and ability to fall asleep anywhere, Tanaka prays that each day will be as uneventful as the last, seeking to preserve his lazy lifestyle however he can by avoiding situations that require him to exert himself. Along with his dependable friend Oota who helps him with tasks he is unable to accomplish, the lethargic teenager constantly deals with events that prevent him from experiencing the quiet and peaceful days he longs for.

Shizuku Tsukishima is an energetic 14-year-old girl who enjoys reading and writing poetry in her free time. Glancing at the checkout cards of her books one evening, she notices that her library books are frequently checked out by a boy named Seiji Amasawa. Curiosity strikes Shizuku, and she decides to search for the boy who shares her love for literature. Meeting a peculiar cat on the train, Shizuku follows the animal and is eventually led to a quaint antique shop, where she learns about a cat statuette known as The Baron. Taking an interest in the shop, she surprisingly finds Seiji, and the two quickly befriend one another. Shizuku learns while acquainting herself with Seiji that he has a dream that he would like to fulfill, causing her dismay as she remains uncertain of her future and has yet to recognize her talents. However, as her relationship with Seiji grows, Shizuku becomes determined to work toward a goal. Guided by the whispers of her heart and inspiration from The Baron, she resolves to carve out her own potential and dreams.