The Great Demon King's Adorable Pet

In short, a big shot takes in an adorable little precog. The more he looks after this timid little thing, the cuter it gets???

The little one's point of view:

I woke up one day with the power to see the future. To escape the terrifying man and the zombies, I have to build a safe castle!

But when I woke up again, there was someone else in my bed!

Why is this demon lord even more twisted than the one in my dreams!!!