She's The Last Heir

The little king's face was serious and stern, unlike those of his peers. He was deep in thought for a while before saying, "I didn't pay much attention to it at that time… But when I finally had some time to think, I realized that the day my uncle came to me on the same night that my parents were murdered…" 

He then chuckled sadly. "Of course, I didn't have any proof at that time, so I didn't tell anyone. Besides, he was my uncle. How could I suspect him? Furthermore, what was important then was to solidify my position as a king. Given my age, you have no idea how many people wanted to either replace me or control me. One night, while I was studying here, I was bored and decided to look at all the hidden items here…"

He then looked at the spell diagram on the floor and said, "And I found traces of someone using this spell diagram recently. Which was odd since my father said this shouldn't be used unless it's absolutely necessary."