The Magical Kingdom of Klyrode summons hundreds of heroes from other worlds every year to fight in their war against the Dark One and his army of powerful demons. Banaza is one of those heroes, summoned from the Royal Capital Paluma, but something's not right—Banaza is only an average merchant. He has no magic, no fighting ability, and his stats are abysmal. Worse, a mishap leaves him unable to return home! Rejected as a hero and stranded in another world, abandoned to the far reaches of the kingdom by a cruel king who just wants him gone, Banaza's fate looks pretty bleak. But what will happen once the failed hero candidate finds himself with super cheat powers once he hits level two?

Although everything the young duke touches perishes, his existence is far from lonely. His spirited siblings Viola and Walter, loyal butler Rob, and the eccentric witches Cuff and Zain are regularly livening up his secluded mansion. But it is the duke's flirty maid, Alice Lendrott, who fills him with the promise of a beautiful tomorrow and the determination to break this hellish spell cast upon him. The identity of the witch who cursed the duke has been uncovered thanks to Zain's unique magic and the help of Daleth, the leader of the underworld. However, the villain is a notoriously fearsome and powerful witch, who, enraged by the duke and his companions' trip back in time, torments them even from the afterlife. Moreover, an unexpected loved one reappears, strengthening the duke and Alice's hope to break the curse and finally close the distance between them.

After passing away, a Japanese office worker finds himself reincarnated in another world as Ars, the newborn son of the noble Louvent family. The Summerforth Empire, where the Louvents rule over a small territory of a few thousand people, is a medieval-like land plagued by social inequality and political instability. As Ars grows older and learns more and more about his new environment, he becomes convinced that war will soon erupt. Fortunately, though Ars was not blessed with unrivaled strength or extraordinary magical aptitude, he does possess Appraisal: a seemingly unique skill that allows him to instantly grasp someone's current abilities and latent talents merely by looking at them. In an effort to prepare his domain for the imminent strife, Ars resolves to enlist the most exceptional people he can find, paying no attention to superficial qualities like race or social status.

Sumireko Ogawa is a busty bookstore clerk who wants to become a novelist after some writing success in her youth. When strange occurrences start cropping up around the city, she teams up with her flirtatious co-worker Ren Adashino to look into them. But Ren is hiding a secret of his own! With their combined skills of occult knowledge, what will they discover as they investigate?