Warning: Exploring this aspect of the So I'm a Spider, So What? Wiki contains heavy spoilers.
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 a 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.
- 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 and help from several mysterious individuals such as Sophia, he manages to become strong again,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 that she laid hidden in the Great Elroe Labyrinth, where she is given sustenance by Güliedistodiez. Once she gains enough stamina, she evolves into her final form, the Arachne, 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. Ariel steps in, finishes off Potimas' robot clone, and calls a truce with Kumoko. Also, with no where else to go, Sophia and the newly vampirized Merazophis decide to tag along as they travel south to the capitol of Sariella, where, in the end, Sophia and Mera decide to join Kumoko, Ariel, and the Puppet Taratects as they travel to the Demon Realm.
Journey to the Demon Realm
- Main Article: Journey to the Demon Realm
After travelling through Sariella and heading into the wasteland between the coalition of countries and the Renxandt Empire, Kumoko (henceforth referred to as White) detects something deep beneath the earth. The group follows her and discovers an underground bunker, accidentally awakening an ancient technological marvel: the G-Fleet. With the sudden appearance of a crisis that threatens what's left of the world, all the major players show up to bring it down, with the end result being White eating the power source of the G-Fleet and gaining enough proficiency in the skill Divinity Expansion to achieve deification. 47 days later, her cocoon hatches and Shiraori is born, though she is completely powerless.
The Wrath of the Sword Demon
- Main Article: The Wrath of the Sword Demon
Demon Life Arc
- Main Article: Demon Life 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
- Main Article: Past Arc
|Past Arc • The Great Elroe Labyrinth • The War in Sariella • Journey to the Demon Realm • The Wrath of the Sword Demon • Demon Life • Human-Demon War • The Fall of Analeit • Elf Village Battle|