Nah, Dark Hero Party was not just limited to a continent. The MC killing the dragon matriarch whatsherface did not just destroy a continent, it completely removed the biological incentive to reproduce from every single lifeform on the planet. Personally, I actually consider that to be a good ending.
We saw bandits and other lowlifes that just lived for carnal pleasure starting to seek their dreams, and people as a whole started pursuing whatever dreams they had abandoned. Life ceased to exist, obviously, but the world was implied to have become a far more peaceful and happy place after everyone lost their sex drive, and a short existence without suffering, at the cost of no future generations being born, is most definitely a good ending, even if it is a tad bit too nihilistic for a lot of people. Tbh, I sometimes wish that DHP was not a hentai, since then I would actually be able to recommend it to people without them looking at me weirdly, since I do consider it to be an incredibly well written piece of fiction
That aside, I actually cannot find the game I was referring to again, but I remember your companions being your childhood friend knight, a cowgirl with strong body odor and a fairy. The main antagonist group was actually made up from people that got cucked by the king (who cucks the girlfriends of all knights that serve him, and fucks all of his female knights) who wanted to summon a legendary demon to destroy the continent as an act of vengeance, as they could not really defeat the kingdom normally. In one of the endings, after killing the main villain, you save his followers from prison and work with them to bring their views into fruition. In another ending you use some sort of super viagra to get a bigger cock than the king and win your girls back, but you day from overdose on the next day.
Also, the game had absolutely ridiculous ahegao faces