Seikishi Rui

Holy Knight Rui, a heroine who fought on many battlefields in the name of the Warrior Goddess.
The battles were often long, her frustration grew day by day as the battles drew on.

One knight, Rui left the castle, not satisfied by the battles of the day.
What she found, was the nest of the infamous demon lord Zordi.

What awaited her in there was a swarm of tentacles, and the wriggling of rice worms.
As the once proud holy knight loses sight of her ideals because of the pleasure, she goes down the path of corruption...

[From DLsite English]