Full name is Shiratori Kuon. Codename: Project SWAN-02. A pitiful test subject who was kidnapped by a mysterious research foundation at the age of 15. His right arm was forcibly amputated and replaced with the wing of a dead swan. Since he became immortal through these experiments 45 years ago, his chronological age is approximately 59. However, his mind and physical appearance remain frozen at 15. He seems to be aware that he is 59 years old. He possesses an unimaginably awkward, loser-like personality. He hates sharp objects and violence. He loves egg dishes. He wears an eyepatch over his right eye.