Itsuwarihime no Kari Goei!? Wanko-kei Shoujo Kishi wa Wakeari Omo ni (Hisokani) Dekiaisareteimasu

Marone became a knight to repay a debt of gratitude to Princess Safinia, who rescued her when she was a child. When he asks her to be his personal guard, she casually refuses, as she has been living as a "Hidden Princess" since she lost her mother and twin brother at the same time. But he is still followed by her like a loyal dog, and perhaps because of this, his attitude softens little by little. The first time you see her, you'll know that she's a very attractive woman...