No premiere date announced yet. The new PV is here. Check out the Crunchyroll article for more information. Synopsis for the first season from AniList:
Suzuki Iruma has just been abandoned and sold to a demon by his irresponsible parents! Surprisingly, the next thing he knows he’s living with the demon who has adopted him as his new grandson, and has been transferred into a school in the demon world where his new “demon” grandfather works as the principal. Thus begins the cowardly Iruma-kun’s extraordinary school life among the otherworldly as he faces his true self, takes on challenges, and rises to become someone great…
Oh nice. I like this silly and wholesome slice-of-life meets fantasy anime. And it doesn’t even have a stupid name like, “That One Time I Got Sold to a Demon by my Wicked Parents but the Demon is actually now my Loving Grandfather… As Long As I Don’t Let Anyone Know I’m Actually A Human As They’ll Kill Me For Sure!”