I'm hoping to find something with a Mario Brothers formula, like Shin Mizukami's Rikara; A prince or king is abducted by an enemy prince or king & needs to be rescued. Or maybe their love is consensual, but their nations are at war with eachother. Bonus point if it's in a historical or fantasy setting.

(This was originally part of a different multi-request post. This particular request never got an answer).

Ou-sama Game (TAKAGI Ryo) I guess this could work. I have never read it but based on the description it does sound like what you are aiming for.
Koi wa Maiorita

Remembrance, a forsaken thing that revokes ignorance and leaves people in doubt, is my only redemption and solace deep within the cascade of white.

The evergreen trees speak of days long past when music mingled with the wind and sweet murmurs brushed our cheeks.

::Looks at cover of Ou-sama Game:: You know, I think I own a physical copy of this manga, not that I could read it raw.