Name That Trauma :: Reader Corvid on an Anime Wedding

Hello to you good folks at Kindertrauma!

When I was young and glued to every T.V. cartoon I could find (this would be the early ‘90s), I saw an anime fantasy film that stuck in my brain. I have never been able to identify it, and I was hoping that you or your readers might be able to help me. Unfortunately I am not sure when the anime itself was made – it may have been from the ‘80s or early ‘90s, probably not earlier than the early ‘80s.

I am also not sure what American channel it aired on (I watched Disney, Nickelodeon, and Cartoon Network, among others). The protagonists were two kids, a boy and a girl, and I believe both were blond. The girl gets kidnapped by a witch and her son (?, or a prince-like character that the witch creates). Actually, it may have been an evil sorcerer, I can't remember the gender! Anyway, there are two scenes that I remember:

1.) The evil prince hypnotizes the young girl into a zombie-like state in order to force her to marry him. In the middle of the wedding ceremony, the boy hero bursts in to stop it. The church doors open to reveal that all the pews are filled with paper cut-outs instead of people, and even the priest is a paper cut-out. When the boy yells at the girl to snap out of it, all the paper cut-outs crumple and flutter to the floor. The boy still can't get the girl to snap out of it – he even grabs her and shakes her.

2.) At the end, the boy hero faces the evil witch/sorcerer. They are on opposite corners of a huge, floating chessboard way up in the air, and the chessboard tips and rocks like a ship. I think the girl is still hypnotized, but once the boy defeats the witch, she wakes up.

I hope someone out there can help me figure this out! By the way, people have suggested the UNICO series as a possible candidate, but it is definitely not from any UNICO film I've seen (despite the giant chessboard and evil witch/sorcerer).

Thanks,

— Corvid

UPDATE: NAME THAT TRAUMA SOLVED! SENSKI is back y'all and he is in on F-I-R-E! Kudos to him for realizing that Corvid was referring to the 1974 Japanese version of JACK & THE BEANSTALK.