Noah Ararat is born into privilege as the 13th prince of an imperial dynasty and granted an existence most can only envy. After all, apart from the access to the empire's finest education and resources, Noah is a reincarnator with the memories of his previous life intact, blessed with an infinite level cap and an elite ability that allows him to utilize his subordinates' skills. Within the imperial court, however, status alone offers no guarantee of safety. While Noah's overwhelming potential sets him apart from his siblings from the moment he begins his training, it also draws the attention of nobles whose interests extend far beyond governance. Inevitably, Noah must learn to navigate the expectations of royalty and the mechanics of his unusual power, as he realizes that privilege invites control as readily as it grants it.

After losing his entire family in a car crash, Taiyou Asano tries to pull away from his childhood friend, Mutsumi Yozakura, but she assures him she is not going anywhere. Nevertheless, Taiyou becomes socially awkward, struggling to make friends at school despite the efforts of his persistent classmates. One day, the vice principal calls Taiyou to his office, only to begin threatening the boy's life. Taiyou is swept away by a stranger and eventually awakens to Mutsumi, who introduces him to her siblings—a family of spies who harbor superhuman abilities. Every generation produces one ordinary human who becomes the family head. Mutsumi is one of these, and the family's mission is to protect her with their lives. The vice principal's real name is Kyoichiro Yozakura, and he is the eldest son of the family. As Kyouichiro believes that Taiyou is a threat to Mutsumi's life, the only way to keep both Taiyou and Mutsumi safe is for them to get married; the family has a rule that prevents them from killing within the Yozakura household. Though at first reluctant, Taiyou agrees in order to protect Mutsumi. Now he must train as a Yozakura spy to ward off the constant threats on the lives of both Mutsumi and himself.

Boogiepop, a rumored shinigami, is said to lurk where they cannot be seen. Five years ago, a string of gruesome murders shocked the populace, and students attributed some of those killings to the aforementioned death god. When mysterious happenings once again affect the lives of those attending Hijiridani High School and Shinyo Academy, whispers of the enigmatic Boogiepop are resurrected. The stories being told may contain partial truths, or perhaps the world as humans know it is more dangerous than previously believed.

Coco, a humble dressmaker's daughter, has always been fascinated by magic and the witches who cast it, despite the strict precautions they take to hide their methods from the public. However, when Coco takes advantage of a golden chance to spy on the skilled witch Qifrey, she realizes that her favorite picture book was a disguised magic book all along! In her excitement, she immediately starts testing out the various spells. When a spell causes a disaster in her home, Qifrey rescues her just in time and decides to train her, realizing that she is the first lead he has found that could help him track down the Brimmed Caps—a dangerous group of heretics who experiment with forbidden body-altering magic and spread magical artifacts among the commoners. But before Coco and Qifrey can confront the Brimmed Caps, she is going to have to improve her magical skills and learn to get along with Qifrey's other apprentices.