Far away from the reaches of demons and war, near the borderland of Zoltan, D-Rank adventurer Red lives a normal existence. Through perseverance and hard work, his dream of starting his own apothecary and peaceful life in the countryside finally came true. Abruptly, Red gets a live-in partner and assistant named Rit—the princess of Duchy Loggervia and an adventurer herself—who gives everything up to join him. Although honest, kind, and loved by all, Red has a secret shared only with Rit: his real name is Gideon, brother of Ruti Ragnason, the Hero and a former member of her party. Ares Drowa, the Sage, kicked Red out of their party after their war against the Demon Lord after deciding he was weak and insignificant. Now, even though Red has left the Hero's party behind by assuming a new life together with Rit, his past has yet to let go of him.

Due to her father's remarriage, robust 16-year-old Himeno Awayuki moves into a large mansion with a beautiful garden—the quintessential dream house for any girl her age. However, much to Himeno's disappointment, her new stepfamily doesn't really seem to like her, as her stepmother often occupies herself with her father, her younger stepsister Mawata ignores her, and her other stepsister—the equally aged Mayune—tries to prank her at every opportunity. But Himeno doesn't have time to dwell into thoughts of hopelessness—her new life has now become involved with a group of seven magical boys known as the Leafe Knights, after they ask her to become a magical princess who can borrow their powers! Although Himeno accepts their request and becomes the Prétear, she feels doubtful in her abilities to protect the world and its Leafe, the source of energy for all life. Will Himeno be able to find happiness among her new family and also save the Earth from the enemy, the Princess of Disaster?

Thanks to the Fruit of Evolution, Seiichi Hiiragi's amazing new life in another world allows him to meet dependable allies and create formidable spells. His abilities catch the attention of Barnabus Ablitt, the principal of the Barbador Academy of Magic, who invites Seiichi to become a teacher at the institution. Coincidentally, Seiichi's classmates from Earth are enrolled there, which will lead to an awkward reunion if he is to meet them. Behind the scenes, however, an enigmatic cult called The Great Devil Order devises a sinister scheme to resurrect their deity and sacrifice the students of Barbador to hasten the process. As Seiichi's power is second to none, it is up to him to protect not only his friends but also the entire world from the looming darkness.

Shiki Toono wakes up in a hospital ward with the ability to see invisible lines. These thin threads, which make up all matter in Shingetsutan, instantly destroy an object when severed. Shiki discovers that if he traces the lines of something, its destruction soon follows. While keeping his supernatural vision a secret, Shiki proceeds to live his sophomore life in peace. However, this peace is short-lived when Shiki encounters a mysterious woman with bright red eyes on his way back from school. Following a sudden psychotic lapse, he appears to kill the woman, and passes out shortly after. As if things couldn't get any worse, Shiki is assailed by a pair of demonic hounds the next day—facing certain death, Shiki is saved by the timely arrival of the same woman from yesterday. She introduces herself as Arcueid Brunestud, a vampire princess. Deciding to team up, Shiki and Arcueid embark on a journey to uncover the truth behind their lineage and the recent string of murders around town.