One thing that makes FINAL FANTASY X such a distinct game is its tone. While there’s plenty of humor and high adventure to be had, there’s also a thick undercurrent of melancholy.
The specter of Sin hangs over the world of Spira at almost all times - the aquatic monstrosity devastates life, and people rely on summoners like Yuna to earn the power to stop it. And as Yuna and her Guardians are all too aware - that ain’t easy.
All other attempts to stop Sin typically end the same way - death and carnage. Operation Mi’ihen is one such disaster.