I stumbled upon 'Immortality: Boon or Curse' during a phase where I was obsessed with philosophical sci-fi, and it left such a deep mark that I went hunting for similar reads. One that immediately comes to mind is 'The Postmortal' by Drew Magary—it’s got that same gritty exploration of what happens when immortality isn’t this glittery, idealized gift but a messy, societal burden. The way it dissects the psychological toll and the dystopian fallout felt eerily familiar. Another gem is 'The First Fifteen Lives of Harry August' by Claire North, which plays with reincarnation rather than eternal life but nails that 'curse' angle beautifully—Harry’s cyclical existence is both a superpower and a prison.
For something more classic, Jorge Luis Borges’ short story 'The Immortal' is a must. It’s dense, poetic, and packs a punch in just a few pages, questioning whether living forever strips life of meaning. If you’re into manga, 'To Your Eternity' by Yoshitoki Ōima is a heartbreaking take on immortality through the eyes of an ageless being who outlives everyone they love. It’s less about the mechanics and more about the emotional weight, which hit me harder than I expected.