Adult PC Game: Netorare Princess ~Hime mo Joou mo Onna Kishi mo~ Final + 3 Steam DLC by Poison Motion Archive

Princess Elencia, the flower of the kingdom, whom he met by fate, traveled with, and vowed to protect for the rest of his life.
Iris, the leader of the Kingsguard Knights, who traveled with her and risked their lives to protect her.
Nadia, Erencia's mother and the beautiful mother of the kingdom, who saved her own life.

The adventurous days that ensued as a result of saving the princess. The hero protects the kingdom to save the heroines.
What he really wanted was his beloved princess, but what he got was only an illusion.