Shidou Itsuka faces greater peril than ever due to his continued involvement with Ratatoskr. He has already sealed 10 Spirits, and Isaac Westcott, leader of Deus Ex Machina Industries, has finally decided to kill Shidou and plunder the Spirits' powers for himself. To achieve his goal, Isaac declares an all-out war against Ratatoskr, forcing the organization to exhaust its resources to ensure Shidou's survival. Despite being severely outnumbered and outmatched, a glimmer of hope exists in the form of the Spirit of Time, Kurumi Tokisaki. Shidou must seal and acquire Kurumi's power to travel to the past and confront the Spirit of Origin—the catalyst that started it all.

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.

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.

When a humble merchant named Banaza is summoned to the magical kingdom of Klyrode in another world, the citizens hope he will become the hero who can take down the threatening Dark Army. Unfortunately, Banaza does not gain any exceptional powers at level one as hero candidates usually do, and he has no way of returning to his old world. As compensation, he is sent to live in a faraway forest. Upon arriving, Banaza levels up once and suddenly gains limitless powers that he now has no idea what to do with. To avoid drawing attention, Banaza changes his appearance and assumes the name Flio. While away from home, he stumbles across a young demi-human girl named Fenrys, who is seemingly searching for the same forest Flio was sent to. However, she attacks him and reveals her true identity—a lupine demon. Luckily, Filo's unrivaled magic overpowers Fenrys, and she swears undying loyalty to him. However, Flio refuses to hold power over her; the two instead begin pretending to be a married couple and embark on a new life together.