The story takes place shortly before Cartaphilus took a nap and Chise became an auditor at the academy. Elias and his friends help Chise prepare for the academy, where in the middle of everyday life, Spriggan visits the mansion on a spooky horse with the words, "The appearance of the ghost hunting association is unusual this time." Gabriel, an ordinary boy who just moved from London, was bored of his environment of parting with friends, being in an unfamiliar location, and everything else. Sitting by the window and glancing beyond, he spotted a purple smoke and decided to chase after it, looking to escape his boredom. Though it should not, the world of the boy begins to converge with the wizards, who live on the other side behind a thick veil.

The successor and branch manager of the Himeya Company—one of the many Undine associations housing female gondoliers—Aika S. Granzchesta surprises everyone when she rejects tradition and refuses to inherit the company's legendary gondola. Aika's apprentice Azusa B. McLaren, unable to wrap her mind around her mentor's unexpected decision, confronts her directly but to little effect. To better understand her reasoning, Azusa and her fellow Undines secretly plan to arrange a meeting with Aika. With the much-awaited winter days in sight, accompanied by the tranquility and sublimity of Neo-Venezia, Aika reminisces about her journey as an Undine that forged her into the person she is today. As she vividly remembers all those invaluable experiences of the past, she trusts they will continue to guide her into the unknown yet boundless future.

A plague-like wind blows across the arid, sandy expanse of a post-apocalyptic Japan. As it sweeps over the living and nonliving alike, rust is all that remains in its wake. The cause of the catastrophic state of the world is believed to be mushroom spores. Bisco Akaboshi, known as the "Man-Eating Mushroom," is a wanted criminal archer whose arrows instantly grow mushrooms wherever they land. However, he is in truth a "Mushroom Protector," a person who spreads fungi in order to enrich the land and return it to its previous state. Alongside the crab Akutagawa and young doctor Milo Nekoyanagi, Bisco ventures through the wastelands of Japan searching for the legendary "Sabikui"—a panacean mushroom said to devour all forms of rust.

As the most powerful entity of all time, the Demon Lord Varvatos thinks life is a big fat snore. When he takes matters into his own hands and decides to reincarnate, he calibrates his magical strength to be perfectly average. But there is no way he could have predicted that everyone in the modern world would be weak as hell, which means he is totally overpowered once again! Reborn under the name Ard, he has ladies fawning over him, the royal family begging him to become the next king, and an ex-minion insisting on killing him?! But Ard has a one-track mind, and he won't stop at anything to achieve his ultimate goal!