Somewhere among the violent and chaotic grasslands of 12th century Mongolia, lives a boy named Temujin. One day, while on the brink of death, he has a fated encounter with a beautiful and mysterious woman that will affect history. This is the story of a boy who will shake the earth.

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. The cause of this catastrophic state? Mushroom spores. At least, that's what everyone thinks. Enter Akaboshi Bisco. He's known as the "Man-Eating Mushroom," and is a wanted archer whose deadly aim instantly sprouts mushrooms wherever they land. However, in truth, he's a "Mushroom Keeper," committed to spreading fungi to enrich the land and return it to its former state.

Salaryman Kirishima Shirou (24 years old) was suddenly laid off. Drinking his sorrows away at a bar one night, he was approached by Ishimura Ai (28 years old), a mysterious and attractive woman who offered him a new job. He signed the contract then and there but discovered the next day that it was actually a marriage certificate and he’s now a full-time househusband! Is this the deal of a lifetime, or did he fall into some sort of trap?!

A young girl—Chloe La Forêt—is alone and unconscious in the Corpse Forest. Well, it's too bad. At least the monsters will finish her off within a few days. Except this girl gets rescued in the nick of time. And the man who finds her? He's her new boss, Alchemist Kurakazu Rintarou. Chloe has a knack for cleaning and thus becomes his housekeeper. But she quickly reveals another hidden talent of hers—necromancy! Watch as this story of science and fiction unfold under one roof.