Light Novels/Volume 4

"A girl can escape the labyrinth but not her mother!"

"I've finally gotten out of the Great Elroe Labyrinth! Now there's nothing left between me and the surface's all-I-can-eat buffet of fruits, sweets, and water wyrms! The only things that may be problematic are the humans already living here...and Mother, who won't stop following me! Right when I thought I had managed to move out, the absolutely massive spider that is stronger than any dragon just invites herself over without so much as a warning, leaving nothing but craters and rubble wherever she goes! If all my spells, traps, and the dungeon itself can't stop Mother, what can...?"

- Official synopsis

Kumo Desu ga, Nani ka? Volume 4 was released on October 8, 2016 in Japan and its English translation was released on November 27, 2018.

Chapters
1) Clear Blue Sky

Characters:

S1) To the Great Elroe Labyrinth

Interlude) The demon lord's aide sighs at the meeting again

2) Spirit battle vs mother

Characters:

S2) Entering the Great Elroe Labyrinth

3) Mother Attack

Characters:

S3) Navigating the Great Elroe Labyrinth

4) A Brush with Death

Characters:

S4) The Terror of the Great Elroe Labyrinth

5) Evolution

Characters:

S5)  Escape from the Great Elroe Labyrinth

6) Guerilla Warfare

Characters:

S6) The Dark Secrets of the Other World

Interlude) God's Hunting Dog

Characters:

7) Demon Lord Attack

Characters:

S7) Reincarnations

8) Returning Monster of the Week Always Gets Killed Right Away

Characters:

S8) The Elf Village

9) Water Spider

Characters:

S9) The Reincarnations in the Elf Village

10) Playing with Dolls

Characters:

S10) The Reincarnation Gathers

Interlude) The Administrators' Reincarnation Allies

Characters:

11) Matricide

Characters:

Interlude) Demon Lord

Characters:

Interlude) Chief of the Elves

Characters:

Final Chapter) First Encounter

Characters:

Extras
There is a special web chapter for questionnaire respondent in Japanese. The special SS chapter is titled "Autumn-leaf Viewing" (紅葉狩り), the special chapter is later adapted into the eight episode of the anime.