This is the deepest part of the dungeon.
Here, the high elf Eleanor is held captive.

One day, a dark elf woman arrives in the dungeon.
She seems to be Eleanor’s acquaintance—and she’s here to rescue her.
Eleanor trusts the dark elf’s abilities and boasts,
“She’ll definitely save me… Alisson is a master of magic, the pride of our nation… You’re finished.”

But then, an idea strikes.
What if he shows Eleanor how he violates the dark elf? It’ll be fun to play with her like that.
With that thought, Millennium puts his plan into motion…

[Translated from dlsite]