A millennium has passed since the catastrophic nuclear war named the "Seven Days of Fire," which destroyed nearly all life on Earth. Humanity now lives in a constant struggle against the treacherous jungle that has evolved in response to the destruction caused by mankind. Filled with poisonous spores and enormous insects, the jungle spreads rapidly across the Earth and threatens to swallow the remnants of the human race.

Away from the jungle exists a peaceful farming kingdom known as the "Valley of the Wind," whose placement by the sea frees it from the spread of the jungle's deadly toxins. The Valley's charismatic young princess, Nausicaä, finds her tranquil kingdom disturbed when an airship from the kingdom of Tolmekia crashes violently in the Valley. After Nausicaä and the citizens of the Valley find a sinister pulsating object in the wreckage, the Valley is suddenly invaded by the Tolmekian military, who intend to revive a dangerous weapon from the Seven Days of Fire. Now Nausicaä must fight to stop the Tolmekians from plunging the Earth into a cataclysm which humanity could never survive, while also protecting the Valley from the encroaching forces of the toxic jungle.

[Written by MAL Rewrite]

All of a sudden, they arrived: parasitic aliens that descended upon Earth and quickly infiltrated humanity by burrowing into the brains of vulnerable targets. These insatiable beings acquire full control of their host and are able to morph into a variety of forms in order to feed on unsuspecting prey. Sixteen-year-old high school student Shinichi Izumi falls victim to one of these parasites, but it fails to take over his brain, ending up in his right hand instead. Unable to relocate, the parasite, now named Migi, has no choice but to rely on Shinichi in order to stay alive. Thus, the pair is forced into an uneasy coexistence and must defend themselves from hostile parasites that hope to eradicate this new threat to their species. [Written by MAL Rewrite]

Following the successful Sanyou campaign, the Qin army, including 1,000-Man Commander Li Xin, inches ever closer to fulfilling King Ying Zheng's dream of unifying China. With a major geographical foothold in the state of Wei now under its control, Qin sets its sights eastward toward the remaining warring states. Meanwhile Li Mu—an unparalleled strategist and the newly appointed prime minister of the state of Zhao—has taken advantage of Zhao's temporary truce with Qin to negotiate with the other states without interruption. Seemingly without warning, Ying Zheng receives news that armies from the states of Chu, Zhao, Wei, Han, Yan, and Qi have crossed into Qin territory. Realizing too late the purpose behind Li Mu's truce with Qin, Zheng quickly gathers his advisors to devise a plan to address the six-state coalition army on their doorstep. For the first time in history, the state of Qin faces complete destruction and must use every resource and strategy at their disposal to prevent themselves from being wiped off the map.

In the mysterious future, crystalline organisms called Gems inhabit a world that has been destroyed by six meteors. Each Gem is assigned a role in order to fight against the Lunarians, a species who attacks them in order to shatter their bodies and use them as decorations. Phosphophyllite, also known as Phos, is a young and fragile Gem who dreams of helping their friends in the war effort. Instead, they are told to compile an encyclopedia because of their delicate condition. After begrudgingly embarking on this task, Phos meets Cinnabar, an intelligent gem who has been relegated to patrolling the isolated island at night because of the corrosive poison their body creates. After seeing how unhappy Cinnabar is, Phos decides to find a role that both of the rejected Gems can enjoy. Houseki no Kuni follows Phos' efforts to be useful and protect their fellow Gems. [Written by MAL Rewrite]