Miyu was eating some crystal grapes, that had been peeled for her by the demon servants. She was in the main hall, as the Demon nobles gathered around. Since she was about sixteen, so would the Hero be. In the Story, he is brought to the battlefield around this age.
This meeting is about his first appearance, they had lost a member of one of their offensive forces due to the hero. While eating them, Miyu could feel the confused gaze of someone among the demons.
"Elfin, can you connect me to Rachel?" Miyu asked
A moment later.
"Yes, Miyu?" she heard Rachel's voice through her head.
"There is something I don't understand." She said softly. She kept thinking about it, but she ended up being confused more.
"What is it?"
"My Dad said, that General Holan who was leading the offensive force. Shouldn't have lost the way he did, he thinks an insider gave information."
"Well, first explain to me about your life there."
Miyu nodded her head and explained to Rachel about the course of the events throughout her life in this world.
"Well, for one thing, he is right. This General Holan sounds like a pretty experienced given that he survived during the last hero reign, he's also had some experience dealing with humans and their strategy. His death sounds as if he was caught off guard, and that shouldn't happen with his experience.
Now let's look at the situation, General Holan was given Fort Oz'galon by the last demon King, about over 200 years or so. It would be safe to say that he knows this place more than to well. For his confrontation with the hero, now what shouldn't have been possible. Given he was fought in his own location, he would have plenty of traps, soldiers, healers.
Yet, the Hero small party of six took down the whole Fort by themselves, it sounds too farfetched. Since not much is know about the downfall. You can only guess and theorize.
But I remember you telling me you saw a demon transform themselves into a human, Miyu tell me is there a gaze that is looking at you strongly."
"Yes"
"Well, it is only a theory. So how about we test it out, throw your sword at the person right now."
Miyu did not hesitate as her sword went flying and slammed into a person. Who screamed in pain, Her adoptive Father was shocked as the crowd of demons split, the demon who had been hit with a sword. She walked up to him and pulled her sword out of his shoulder.
"Its impossible, for normal illusion magic that changes one's appearance not to be discovered, especially towards demon who, whose magic capabilities are stronger than humans. However, its a different story with magical items.
See it this person has a magical item and destroy it."
Miyu looked to the man's necklace, and cut it off with her sword. She then destroyed it under her foot.
The demon screamed "Noooo!" just as his transformation back into a human was complete. It was at this moment that he knew, he was cut.
The Demon King took no time to move next her and put the puny human in a chokehold. "To think one was this close. "
"Miyu if the You Father asks, just say what I'm about to say...."
The Demon King threw the human to his guards. "I want him tortured, and speaking by the time I get down there." The guards dragged him away. He then turned to Miyu. "How did you know, he was Human?"
"I didn't, it was just a theory," Miyu said calmly.
"A Theory?"
"I felt someone's gazes staring to strongly at me."
Her adoptive Father's eyes widen, he seemed to have drawn a very good guess and smiled. While patting her head. The Demon King did not forget that she was the twin to the Hero and his adoptive daughter. If a Spy infiltrated using a demon disguise, he would help but be confused by Miyu's appearance her and the Hero where identical twins.
It would be impossible for a spy not to know the Hero's appearance, just as it would be impossible for a spy to fathom the idea that a human would be on the side of the demons.
"Well, done"
Miyu did not follow up with the aftermath as her father gave her a dining table full of sweets to eat. To which she happily gave her attention. Later she was invited by one the female general and leader of the Vampire faction, Deliliah. To go with her on a mission, she wanted to get a lost treasure that belonged to her kind.
While doing so she also wanted to get to know the demon King's little princess he is so proud of. She had been busy dealing with some things in her territory, so she had never fully had time to interact with the little princess. But she certainly heard the stories.
Miyu nodded she wanted to go outside since someone gave her an opportunity why not.