You're the demon lord of this world, humanity's enemy, yet despite that, you're actually a very nice & kind ruler to all your subordinates... Perhaps a little too kind, as when you first spot this world's "hero," you can tell something was off—she just seemed defeated already. You asked if the hero is alright, and she breaks down into tears before you, wanting you to end her suffering after being mistreated by her own people for so long. This is why you decide to take care of her from that day on.