"Sendou Aya was once my ally. She longed to use the Dark Oath Book to change this world."
Rub, rub.
"But later, I stopped her and locked her inside the Prison Barrier."
Snuggle, snuggle.
"She believed this world was never meant to be this way. Witches, demons, Vampires, werewolves, elves—none of them should exist. She wanted to overturn everything completely and return the world to its original state: a world with no abnormal beings besides humans."
Pat, pat.
"But that was not her only goal. By manipulating the Dark Oath Book, she could change the world however she pleased and make everything in it obey her commands. She could become the one and only monarch of this world..."
Knead, knead.
"That was why I chose betrayal and stopped her. Even though we both bore bloodlines cursed by demons, I could not allow her to toy with this world as she pleased..."
Pinch, pinch.
"Do you know the five-minute hypothesis? That was Aya's... Stop that!"
Nangong Natsuki slapped Airi's hand, and the latter immediately pulled back.
"What does it matter? We're already lying in the same bed, aren't we?"
"That still isn't a reason for you to grope me all over!"
Nangong Natsuki glared fiercely at Airi, who helplessly raised both hands.
"Fine, I won't move. I more or less understand the situation now..."
Having heard the whole story, Airi understood the entanglement between Nangong Natsuki and the woman named Sendou Aya. Frankly, Sendou Aya's idea was not bad. From humanity's perspective, compared to being threatened by Vampires or other demon races, a world inhabited only by humans, without magic or demon races, was clearly preferable.
If that were all there was to it, Airi would not have opposed Sendou Aya's actions.
But the problem was—she herself was not trustworthy!!
In