The best Japanese Harry Potter homage is probably Little Witch Academia (though some aspects of LWA are much closer to The Worst Witch, another British book series about kids at "magic school" that predates the first Harry Potter book by over 2 decades).
If it wasn't for the title I would've probably assumed that this is just some other anime witch girl on broom action, like, I dunno, probably 50% of all female anime characters
I like the commercial and I'm glad that manga artist Eisaku KUBONOUCHI wasn't trying to ape the Miyazaki designs with the faces (at least if they couldn't get Hayao Miyazaki himself to work on this commercial). I do find it a little weird that they transposed the setting from a fantasy mid-20th-century Scandinavia to modern Japan, though.