"So I'm a Spider, So What?" is an isekai anime series that centers on a high school classroom that is reincarnated into a fantasy world following a mysterious explosion. The protagonist, a girl who was once an ordinary student, awakens to find herself reborn as a low-level spider monster in a dangerous dungeon. Navigating this perilous environment, she must rely on her wits, adaptability, and newly acquired skills to survive. The series alternates between her perspective and that of her former classmates, who have also been reincarnated but into more privileged forms, such as humans, elves, and nobles.

The spider protagonist, later named Kumoko, faces constant threats from stronger monsters and the dungeon's harsh conditions. Through her struggles, she gains experience points, levels up, and evolves into more powerful spider forms. Her journey is marked by humor, resourcefulness, and a determination to overcome her seemingly insurmountable odds. Meanwhile, her classmates experience their own challenges in the human world, where political intrigue, wars, and the machinations of powerful beings shape their fates. Over time, it becomes clear that their reincarnation is tied to a larger, more complex narrative involving gods, reincarnated heroes, and the world's impending destruction.

The series explores themes of survival, identity, and the disparity between privilege and adversity. Kumoko's story is a blend of action, comedy, and introspection, as she grapples with her new existence and the moral ambiguities of her actions. The parallel narratives of her classmates provide a contrasting perspective, highlighting the different paths and struggles they face in the same world. As the story progresses, the connections between the spider's journey and the human world's events become increasingly intertwined, revealing a deeper lore and setting the stage for larger conflicts. The anime balances its darker undertones with lighthearted moments, creating a dynamic and engaging narrative.