The Warden's older Brother (Nanbaka)

There is a saying that most younger siblings have heard before and they believed that saying especially coming from a well known family name.
The saying goes as following; "As the youngest sibling you think you get all of the attention and love from the parents. Yet not all things are true including when your older sibling is getting the attention. Leaving you in their shadow as a second place metal"

That's how Momoko felt when growing up in the shadows of her older brother, Y/n Hyakushiki., who was always been the favorite of the two. Even since Momoko was born and could remember, all of the attention was on her older brother (by six years) Y./n Hyakushiki.

Even now adults would Momoko and her older brother come to terms or will Momoko Jealously blow and their bother-sister relationship be no more...