In London, Joker and the British Library staff uncovers evidence that someone has created various super-powered clones (or "I-Jin") of famous historical figures. The I-Jin, led by a clone of Ikkyu Soujun, are trying to steal the sheet music in Yomiko's book to reconstruct Ludwig van Beethoven's supposedly lost "Death Symphony," which causes anyone who hears it to commit suicide. The symphony figures in a plot to eliminate most of humankind, which Ikkyu sees as foolish, selfish and generally unworthy of life.