Silver Eyes are objects in the world of Kill the Past. They appear in The Silver Case and Flower, Sun, and Rain. They grant supposed immortality to those who replace one of their own eyes (consistently the left eye) with a Silver one. However, the exact powers of the Silver Eyes are unclear and have been said to include the aforementioned immortality and youth, indirect immortality through transferring to another body, and the ability to loop time. It is revealed that Lospass Island is actually a breeding ground for the rare breed of hyenas that have the Silver Eyes. Sundance Shot, Tetsuguro Kusabi and Tokio Morishima all have Silver Eyes (as of FSR at least).