The Anime Lad
An ordinary student wakes in a fantasy dungeon as a newly hatched spider. She is small and hungry. Surrounding creatures consider those qualities an invitation to lunch. With no guide beyond game-like skill information, she tests webs and improvised traps against stronger enemies. Her internal monologue provides morale because the dungeon has declined to provide colleagues.
Super Eyepatch Fox
Reincarnation gives the heroine eight legs and a position near the dungeon's food-chain floor. She uses web traps guided by human reasoning and acquired skills to survive monsters far above her weight class. Much of the appeal comes from one tiny creature rapidly analyzing terrible options while talking herself through fear at top speed.
Gigguku
She gets the worst possible fantasy spawn and refuses to stop moving. Every scrap of food and every usable strand of web becomes a tactical breakthrough because she has absolutely nothing else. Her running commentary is a one-spider variety show, bouncing from terror to ridiculous confidence while the dungeon keeps presenting enemies that look like immediate game over screens.
Father's Basement
The game interface is familiar isekai furniture, and the animation does not always sell the scale of its dungeon. The heroine does. Starting as a fragile spider forces her to earn basic survival through observation and traps. Her nonstop chatter could become exhausting, but it also turns solitary grinding into character comedy and makes every tiny upgrade feel materially useful.