Sakamoto Kasumi (サカモト カスミ) is government employee investigating the Darwin's Game and a former department detective for Metropolitan Police.
Kasumi has long black hair that she has tied into a ponytail at the back of her head, with two long strands on the sides of her head. She wears a white shirt and a dark suit coat and pants.
Kasumi takes her job to investigate the Darwin's Game seriously. During her first meeting with Sudou Kaname, she was shown to get annoyed with him for acting casual to people older than him, and later to Maesaka Ryuuji when he was disappointed that they didn't have much information compared to what they were revealing.
Sigil: As a Darwin's Game player, Kasumi has a sigil, though she hasn't been shown using it.
Equipment: As a former police officer and government employee, Kasumi uses a gun in combat.