Reborn as a Demon Lord, I Became a Little Girl's Summoned Beast

(Western fantasy + no System + everyday life + snark)

Xilie was reborn as a Demon King. To escape a spatial rift, he became a little girl’s summoned beast in a lower plane!

Naturally, His Majesty the Demon King plans to turn this light-worshipping little girl into a heretic!

A little everyday bickering, and a companion on a journey.

So how does a Demon King raise a little girl into a saint?

Is it by protecting her in times of danger, comforting her when she’s down, or sharing a few flustering little moments?