Yuusha wa Maou ga Suki Rashii

The Demon King wields the most powerful ability of all: the power to read other people's minds. With that gift, he has risen to the top of the demons and laid waste to humanity. But he can't shake the thought that the more he reads everyone's minds, the less he can trust anyone. And so the Demon King lives a life of solitude, until one day the legendary female hero appears before him. It's the start of a pitched battle for the fate of humans and demons... Or so he thought. "The real Demon King! I've been dying to meet you...! You're so cool!!" Or something like that... (Source: Kadokawa, translated)