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?

Despite a rough start, Makoto Misumi's life in another world takes a positive turn when he meets more demihumans who recognize his presence. Now as the leader of a fast-growing demihuman community, Makoto wishes to make human society more accepting of them and thus builds a business showcasing the demihumans' abilities. To extend his reach further, Makoto enrolls at the Rotsgard Academy to learn magic and expand his business venture there. Meanwhile, the goddess who summoned and forsaken Makoto had brought two other people to her world shortly after sending him away, making them heroes of their respective nations. Given enough time, Makoto's path will intertwine with both of these heroes, which may cause the world to take a drastic direction.

Three years into the war, Mahito Maki loses his mother in a tragic fire at the hospital. Shortly thereafter, his father marries Natsuko, the younger sister of Mahito's mother. They take Mahito out of Tokyo to seek refuge in his late mother's rural family home. There, Mahito is constantly taunted by a strange gray heron, who seems to have taken an interest in him. Unable to come to terms with his loss and struggling to adjust to a new life in an unfamiliar place, the boy is shocked to discover that Natsuko is pregnant. To make matters worse, the pesky heron can speak—and claims that Mahito's mother is still alive. Luring him into a mysterious tower near the residence, the heron says that Mahito can save her from death, but the boy is not easily swayed. When Natsuko disappears one day, however, Mahito watches her walk into the tower and becomes compelled to venture in to rescue her. He soon finds himself falling into another world below his, where life and death seem to be entwined. As he navigates through this foreign realm to find Natsuko, Mahito must understand what it means to live if he wants to safely return home.

As a young boy, Prince Oscar Lyeth Increatos Loz Farsas was cursed by the Witch of Silence, rendering it all but impossible for any woman to bear him a child. After 15 years of fruitlessly seeking a way to lift the spell, Oscar resorts to enlisting the help of a different witch. To this end, he heads to the Azure Tower, home of the Witch of the Azure Moon. Ascending the tower is no easy task; for decades, no one has overcome the array of traps, puzzles, and enemies designed to repulse any challengers. Oscar, however, easily climbs to the top, where he meets the fabled witch, Tinasha. To the prince's surprise, despite being hundreds of years old, Tinasha looks like a beautiful young woman in her late teens. Oscar explains his circumstances to the witch, who quickly perceives the true nature of his affliction. Though she claims that undoing the spell would be tremendously difficult, Tinasha proposes a workaround—to find Oscar a partner capable of withstanding the curse's effects. Realizing that such a woman is right in front of his eyes, Oscar boldly tells the witch to marry him. Though he is promptly rejected, the young prince refuses to back down, and the two eventually reach an agreement: Tinasha will leave the tower and live with Oscar for the next year. As the two continue searching for a way to lift Oscar's curse, word of Tinasha's emergence from isolation spreads, catching the attention of all sorts of old acquaintances.