Toujou Basara is a high school student whose father has suddenly just remarried. His father then departs overseas leaving Basara with two new beautiful step-sisters. Little does he know, his new sisters, Mio and Maria are actually the new Demon Lord and a succubus!? Almost trapped into a life of servitude, Basara forms a reverse contract by accident and ends up becoming Mio's master! Hijinks ensue as Basara finds himself in one ecchi situation after another. However, Mio's life is in danger as she is pursued by demons and heroes!

Seiya Kanie, believes that the beautiful but reserved Isuzu Sento has invited him on a date at an amusement park called Amagi Brilliant Park. Much to his chagrin, not only is the location a run-down facility, the supposed date is merely a recruitment tour where Sento and Princess Latifa Fleuranza, the owner of the theme park, ask him to become the park's new manager. Their cause for desperation? As stipulated in a land-use contract, Amagi has less than three months to meet a quota of 500,000 guests, or the park will be closed for good and the land redeveloped by a greedy real-estate company. Seiya is won over by the revelation that Amagi is no ordinary amusement park; many of its employees are mysterious magical beings who live in the human world and are nourished by the energy created by people having fun. Entrusted with the hopes and dreams of this far-off enchanted land, Seiya must now use his many skills to bring Amagi back on its feet, or watch it crumble before his eyes.

Thirty years ago a strange phenomenon called a "spacequake" devastated the center of Eurasia, claiming the lives of at least 150 million people. Since then, smaller spacequakes plague the world on an irregular basis. Shido Itsuka, a seemingly ordinary high schooler comes across a mysterious girl at the ground zero of a spacequake and learns she is one of the "Spirits" who are the real cause of the spacequakes that occur when they manifest themselves in the world. He is recruited to make use of his mysterious ability to seal the Spirits' powers thus stopping them from being a threat to mankind. However, there is a catch: to seal a Spirit's power, he must make her fall in love with him and kiss him.

Mochizuki General Hospital boasts some of the most well-trained nurses in town. But though these ladies spend much of their day battling sickness, their after-hours are spent fighting a very different sort of disease... Under the leadership of the hospital chairman, a handful of staff members and local teenagers form a group of mercenary assassins, targeting the "cancers" of society and excising those individuals before their wickedness spreads.

Humanity was driven off the land by the threat of magical armored insects and now live in aerial floating cities. Its defenses lie in wizards who fight the insects with magic in mid-air. Kanata Age is a young man who lives on the floating wizard academy city of "Misutogan." He was once celebrated as the "Black Master Swordsman," the elite ace of the S128 special team. However, he is now despised as the "traitor of the special team." One day, he is assigned as the instructor of E601, a team that has suffered 10 consecutive defeats. E601 has three girls — Misora Whitale, Lecty Eisenach, and Rico Flamel — with one or two peculiar quirks.

High school student Kanade Amakusa suffers from a curse called "Absolute Choice,” which requires him to select an action from a list of options that appear before him at random. Unfortunately, Amakusa’s choices are limited to the weird and perverse, causing him to become something of a social outcast at school. But when a sudden choice on the way home from school causes a beautiful girl to fall out of the sky, Amakusa might’ve found the key to break his curse for good!

Staz is a vampire from the surreal "Demon World", and Fuyumi, an ordinary girl, accidentally wanders into the Demon World through a portal. Subsequently after meeting each other, Fuyumi is killed by a carnivorous plant and turned into a ghost, causing Staz to take responsibility and pledge to help bring her back to life.

Shinichirou decides to look for a job in order to pay his rent, and his teacher suggests that he work for someone at their house doing housekeeping; however, the person who hired him was Sakuya, a girl who is the 37th head of the Shimazu family, and her job is to exorcise and eliminate unwanted creatures. Shinichirou accidentally releases one of the creatures that Sakuya captures and they cooperate to catch it.

Ganta is the only survivor after a mysterious man in red slaughters a classroom full of teenagers. He's framed for the carnage, sentenced to die, and locked away in the most twisted prison ever built: Deadman Wonderland. And then it gets worse.