Otonawa Sadako is a scary girl, she always walks with an intimidating air, she is tall and a little muscular. Sadako is very shy and introverted, she does not have a conversation of long sentences, having only shorts words. Everyone is afraid of her because she looks like she's going to hit someone or looks like a ghost from a horror movie. Her voice is always slow and cold like a dead person, her skin is pale like a ghost, her dark and gloomy eyes are covered by her fringe of black hair.