Older Elite Knight Is Cute Only In Front Of Me

Story:

I'm the kingdom's strongest wunderkind, my name is Haru, I'm 16 years old. I've been appointed to the Order of Knights. The commander of this order, where the strongest kingdoms gather to become the elite, is Karen-san. A 29-year-old single woman. Though afraid of her, she still remains a strong and noble knight. And I finally fell in love with her!