Despite being one of the most promising candidates, Allen fails the final exam for the position of royal court sorcerer, forcing him to abandon his ambitions and return home. Adding to his woes, he does not even have enough money for the train fare back, stranding him. With help from a former professor, Allen secures an unusual job offer: to be the private tutor of the daughter of Duke Howard, one of the kingdom's most powerful nobles. The girl, Tina, however, has one critical flaw—she is completely unable to use magic. Though her academic prowess is nothing short of prodigious, intellect alone is not enough for the fast-approaching entrance exams to the prestigious Royal Academy. Moreover, countless magic instructors have tried to solve her problem and gave up in the process. To help Tina overcome her limitations, Allen must dig deeper into the roots of her magical inability, and, in doing so, uncover far more than he ever signed up for.

Ten years ago, a volcanic eruption brought Japan's Ayaka Islands to the brink of destruction. Since then, Yukito Yanagi has lived with foster families on the mainland, but he has isolated himself from others following a disturbing incident. Due to the wishes of his late father, Makoto, Yukito is brought back to his birthplace on the day of his middle school graduation. There he meets Makoto's disciples and learns of the supernatural state of the region. Mysterious life forms known as Mitama inhabit the islands, but their potential to feed off humans' negative energy and turn into ferocious monsters called Ara-Mitama endangers the islanders' lives. Yukito discovers that, like his father, he is a Ley Master—a special individual with abilities akin to magic, tasked with pacifying the Ara-Mitama. As he learns to overcome his trauma and control his powers, Yukito decides to follow in his father's footsteps and become a first-rate Ley Master to protect the peace of Ayaka.

Homeless and fresh out of employment, Mito Yamamoto faces familiar loneliness and despair. Luck is simply not on Mito's side; when he stumbles upon a cafe and cuts his hand, a strange server named Ruka Saotome licks the blood from his wound and even dramatically retches at its apparent disgusting taste. Offended and dispirited, Mito runs off to a bridge, hoping to put an end to his misery. But when Mito accidentally slips, he is miraculously saved by Ruka, who reveals he is a vampire. Unable to drink blood from just any woman for mysterious reasons, Ruka proposes that Mito become his thrall—a vampire's human servant and primary source of food. In this deal, Ruka will shower Mito with love to sweeten his blood, and Mito will gain a warm place to call home. However, there is an issue: Mito is a girl! Concealing her long, flowing hair and feminine body, Mito readily takes this chance and enrolls in the Hijirigaoka Boys' High School while working part-time at the cafe with Ruka. But the more Mito's bond with Ruka deepens, the more she struggles to hide her secret.

Haruka Shinozaki has been interested in the class representative, Akiho Kousaka, since his first year in high school. She is attractive, good at sports, and is an all-around model student. Since they are in the same class this year, Shinozaki decides to confess his feelings—and, to his shock, Kousaka agrees to be his girlfriend! However, he finds that Kousaka is a bit stranger than he first thought: this seemingly perfect girl has never been in a relationship. But even though she is inexperienced, she vows to please Shinozaki in every way she can... such as learning multiple sex positions or his fetishes. Shinozaki tries to assure her that her studies into such subjects aren't necessary, but Kousaka devotes herself to making him happy in more ways than one.