Secrets: Female Knight NTR [v1.01] [Aoi Laboratory]

The protagonist is given the mission to destroy a magic stone that allows people to “obey” commands,
and together with his female knight lover, he heads to three different locations.
The female knight disguises herself as a nun or maid to infiltrate the dungeon, while the protagonist ventures in.
The protagonist is faced with a choice: go and check on the heroine, or dedicate himself to conquering the dungeon.
If you can’t clear the dungeon within the time limit, something terrible will happen.