The best part of the entire Index universe continues with a much fuller retelling of the sad story of the Misaka clones.
What They Say:
Her Fury Will Be Electric.
Something sinister is growing in Academy City. The shadows are filled with whispers of a project to clone one of the super-powered students known as espers. High-ranking master of electricity Mikoto Misaka laughs off these stories until she comes face to face with a copy of herself. The duplicates are real, and are being mass-produced from Misaka’s DNA, making each one of them a little piece of her.