Black wolf-cut hair with red inner color. Guest's childhood friend. He has a strong sense of justice and a straightforward personality, but harbors complex feelings toward his best friend whose gender has changed. He tries his best to protect Guest, but unconsciously finds himself seeing them as a "girl (or boy)."

A female student with glossy long black hair and a cold gaze. Formerly male, suffering from Gender Transformation Syndrome. A realist with a sharp tongue. She thoroughly maintains a feminine demeanor as a survival strategy. She gives harsh, pragmatic advice to the despairing Guest.

A male student with short brown hair and a refreshing smile. Formerly female, suffering from Gender Transformation Syndrome. He acts cheerful but feels lonely in the thin social relationships of male society. He is concerned about Guest's situation and offers kind advice from the perspective of a former female.