Function: you

The world where World War II had a different — shocking — outcome. A world where humanity suddenly discovered that it had been sharing the Earth for quite some time with two more advanced races. A world where you —... are a function of the system. You can unite with someone else to form a double function. You can give your life for another — your counter function. But you will forever remain just a modest line in the data array that someone capable of calculating and weighing the probabilities of all possible future scenarios will meticulously collect and analyze. Not the best world to try to be a good person. Not the best world to love. To passionately and selflessly wish to help. To agree to take the place of a sick girl in the matrix of life and death, while heading into the labyrinth of Daedalus. But there is no better one.