Story Arcs

The beginning of the story is the end of another, where a Hero and a Demon King fight an explosive battle that opens up a dimensional rift into an high school classroom in Japan. The rift kills all of the students and their teacher, who are transported to another world.

Great Elroe Labyrinth Arc

 * Main Article: Great Elroe Labyrinth Arc

Kumoko is born in the Great Elroe Labyrinth as a Small Lesser Taratect, the weakest monster in the world. She laments her situation but soon discovers the System and begins to manipulate it to her own needs in order to grow stronger and survive. It takes a while, but she is eventually able to hold her own amongst the strongest monsters in the cave before encountering humans for the first time. This deadly encounter, for the humans, ends with her gaining the moniker of "Nightmare of the Labyrinth". She uses the humans who escaped her slaughter to lead her to the surface, but she encounters the Demon Lord and needs to fight off her mother, who bursts out from the Labyrinth to chase her down. After a long, drawn out battle, Kumoko is finally able to escape outside.

Academy Arc

 * Main Article: Academy Arc

The other students that where killed during the disaster on Earth are born with their memories and grow up. Some of them are able to meet, as is the case with Schlain, his best friend Karnatia, the Earth Wyrm Feirune, their teacher Filimøs, the first prince of the Renxandt Empire Hugo, and Saintess Candidate Yuri, though the rest of the class's whereabouts are unknown. Everyone attends the Royal Academy in the Kingdom of Analeit, but some complications arise and their new school life is abruptly cut short.

The Fall of Analeit

 * Main Article: The Fall of Analeit

Hugo was expelled from the Kingdom's Royal Academy due to misuse of his powers to attack another student, but plans revenge against Filimøs, who had stripped him of all his skills, and Schlain his rival at school. With the powers of a Ruler Skill, he manages to become stronger and topple the entire Kingdom and turn Schlain into a fugitive. Schlain's group flees to the Elven Village with Filimøs, where they meet the rest of the reincarnated class, who have mixed feelings about being taken by Filimøs and losing their chance at a new life.

The War in Sariella

 * Main Article: The War in Sariella

Having escaped the clutches of Ariel and Mother, Kumoko begins her life on the surface as a protector of a small county in the country of Sariella, which happened when she saved the lord's wife from bandits. After wiping out the bandits from the surrounding area and healing many people using magic, she is worshipped as the Divine Beast, a servant of the Goddess. This causes issues with the Word of God Church and the country of Ohts, who is dismayed at the damage Kumoko did to their country upon leaving the Great Elroe Labyrinth. A war between the two countries begins, though Kumoko intervenes on the side of Sariella. The battle is interrupted by the sudden appearance of Ariel, who destroys Kumoko with Abyss Magic.

Kumoko, by manipulating her soul, is reborn from one of her own eggs, where she is given sustenance by Güliedistodiez. Once she gains enough stamina, she evolves into her final form and heads back to the surface, where she finds Keren County under attack by Ohts. She ends up saving Sophia, one of the reincarnations, from Potimas Harrifenas, the elven Patriarch.

Journey to the Demon Realm

 * Main Article: Journey to the Demon Realm

The Wrath of the Sword Demon

 * Main Article: The Wrath of the Sword Demon

Demon Life Arc

 * Main Article: Demon Life Arc

Hero Arc

 * Main Article: Hero Arc

The Great Human-Demon War

 * Main Article: The Great Human-Demon War

Elf Village Battle

 * Main Article: Elf Village Battle

The Past

 * Main Article: Past Arc