フィオナ・ニーズリック

Profession: The Hero's Personal Maid
Country: Between Dimensions, The Keter Underworld
Race: Demon
Height: A bit short
Breast size: Big

The Keter Underworld exists in a dimensional gap that can only be glimpsed when a born dreamer experiences some kind of alkaloid. People call the creatures that live there demons. 

In the Keter underworld, the king's absence continued for a daunting number of years. That's because the king didn't have the power to materialize, but his reincarnation was finally found. That is the hero.

Fiona is sent to the main character as a maid to encourage the king's return. Her body and soul, all for the future king...

"Fiona's body and mind is now yours, master. From now on, I will abide by what you want..."