Reizoku no Himekishi Shimai ~Owaranai Orc no Eikyuu Naedoko by ZION (Jap)

When a princess is born in some small country, Arshan,
He became a member of an elite unit defending a country called the Knights of Hime,
There was a legend to protect the country from nearby demons.
The eldest daughter, Scarlet, currently serves as captain.
Once the sister of Princess Knight Esther as an entrance exam,
To head to the dungeon, which is an oak nest.
However, it was turned into an unexpected cave of orcs.