Description from Viz :
The story A, A' raises a troubling question : How would you feel if your lover died - and was replaced by a clone ? Could you recreate your relationship with someone who was physically exactly the same but didn't share any memories of your life together ? in 4/4, teenaged Mori flunks out of an ESP training program. But when he meets Trill, a beautiful Unicorn, his latent abilities begin to blossom...In X+Y, Hagio uses science fiction to explore questions of gender and sexual identity. Time has passed, and once again, Mori finds himself inexorably attracted to a member of the unicorn race - but this unicorn is male...and so is Mori.

X+Y won Seiun Award in manga category in 1985