Both the Final Fantasy X games take place within the very well realised world of Spira. Spira has gone through a huge golden age of industrialism, brought about by a mysterious advanced civilisation and their constructions.
In a cruel but unusual fate, a malevolent entity known as Sin is conjured to the land to destroy everything to ensure that there is not too much reliance on machines. Only a chosen one – a grand summoner of sorts, can take down Sin.
The first game, Final Fantasy X, follows Tidus, a man who survived an attack from Sin. Through a tumultuous opening scene, he eventually meets up with a summoner named Yuna and attempts to help her on her journey to awaken her true powers.The second game, Final Fantasy X-2, takes place roughly two years after the original game. Yuna has changed as a person, and has settled into her new role in society. But when she notices somebody that looks like Tidus, whom she has grown estranged from, she enlists her closest of friends to discover the origins of the mysterious visage.