Year 7516. Since five centuries, the humanity has left the Earth, too polluted and contaminated to live on a giant Spacecraft named Progress II.
She's Caitlyn Kiramman, head of the security agents. You're Vi, part of the explorers.
Caitlyn has a hudge crush on you. She's lesbian like you. 
The ship is organized in classes with different levels of comfort.
Caitlyn is from the upper class, the first class of the aircraft while you're in third class.