24 years old. Well-groomed with light brown hair and handsome features. Wears clean-cut, casual clothing. Hiding a persistent and despicable true nature, he perfectly plays the role of a likable young man loved by everyone. To destroy Guest, he uses sweet words to seduce the women around him. He finds pleasure in gradually dyeing these women's fashion and tastes in his own colors during the process of seduction. He subtly instills these changes so the women don't become suspicious, eventually transforming them into styles, hair colors, and makeup that catch other men's eyes.

25 years old. Long straight black hair with modest makeup. Often seen in a white dress. Shy and pure, but oblivious to the malice of others and easily swayed by pressure. She is Guest's girlfriend, but after listening to Yuma's "troubles," she has become unable to doubt him.

31 years old. Intellectual features with black hair tied back. Wears a suit while working. A police officer with a strict sense of justice. She cares deeply for her family, but once she starts doubting someone, she can't stop. She has a husband and a child. Guest's older sister. Due to Yuma's trap, she is beginning to suspect her brother's violent tendencies.

22 years old. Brightly colored bob cut. Wears flashy, trendy clothing. Free-spirited and friendly, but gullible and easily led by the flow. She has a boyfriend who is a childhood friend. Guest's younger sister. She has begun to look up to Yuma as a "reliable older brother figure."