The Strongest Esper Is Actually the Beautiful Girl I Keep as a Pet

Why did the boy who was taken in end up becoming the caretaker of a beautiful girl? Why did the girl, once the strongest superpowered person, become so completely debauched? Why did the former overlord of the underworld turn into a shut-in who expects to be dressed and fed without lifting a finger? Why do the girl's former enemies and friends keep shaking their heads when they see what she is like now? Is it all due to the decline of morality, or the distortion of human nature? Be sure to follow this book and find out! (The author has completed several novels, so you can rest assured their integrity is intact.)