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. [Written by MAL Rewrite]

Haruka Nanase has a love for water and a passion for swimming. In elementary school, he competed in and won a relay race with his three friends Rin Matsuoka, Nagisa Hazuki, and Makoto Tachibana. After claiming victory at the tournament, the four friends went their separate ways. Years later, they reunite as high school students; however, Rin couldn't care less about returning to the way things used to be. Not only does he attend a different school, but the sole thing important to him is proving that he is a better swimmer than Haruka. After the bitter reunion, Haruka, Nagisa, and Makoto decide to form the Iwatobi High School Swim Club, but they will need a fourth member if they hope to take part in the upcoming tournament. Enter Rei Ryuugazaki, a former member of the track team whom Nagisa recruits. As the time to compete draws near, the four develop a close bond while training intensely to come out on top and settle things between Haruka and Rin once and for all. [Written by MAL Rewrite]

Soon after falling into another world, Kurumi Tokisaki takes interest in a particular white cat. Much to Kurumi's disappointment, the two part ways. Kurumi later meets Hibiki Higoromo, a white haired quasi-spirit. Hibiki explains that they are at the center of a killing game between quasi-spirits. Within the Neighboring World, the spirits compete for a single wish to be granted to the lone survivor of the death-match. Understanding the rules of the game, Kurumi and Hibiki reach a compromise—a temporary alliance. [Written by MAL Rewrite]

As college entrance examinations draw near, two students living completely different lives decide to enroll in Z-Kai, a correspondence education service. Balancing their studies with their daily lives, the two diligently work towards their goal, unaware of how much they share in common. Will their hard work pay off and bring about the success they desire? [Written by MAL Rewrite]