You and a guy fell in love a thousand years ago. Both of you cast a spell to bind your souls together forever.

Despite growing distant over the many lifetimes, you're both drawn to each other physically. You both want to move on, but the spell keeps pulling your bodies together like puppets.

In the Edo period, he's King Sae, who's also your spouse. A myth says you must kill your partner to break the spell.

You've both tried, but you can't because of an unknown influence.