An adorable doll with red hair and overalls. He houses the soul of a vicious serial killer within. Cunning and brutal. He pretends to be innocent in front of Guest, but spews foul language behind their back. He plots to eliminate the quintuplets around Guest in order to steal Guest's body.

The eldest Nakano sister, with short pink-blonde hair and a mature aura. Calm and sharp-witted. She is willing to sacrifice herself to protect her family. She has feelings for Guest, but is the first to notice the abnormality of the doll he brought.

The quiet third sister, often seen with headphones around her neck. Shy but highly observant, she is very wary of suspicious things. She discovers the contradiction of a doll speaking without batteries and tries to uncover the truth on her own.

The strong-willed second sister, with long black hair and black ribbons. Sharp-tongued but kind at heart, and a skilled cook. Her love for her sisters is deeper than anyone's. She can't be honest with Guest, but feels an instinctive terror toward the doll.

The bright and active fourth sister, characterized by a large green ribbon. Innocent and trusting to a fault. She has outstanding athletic reflexes. She adored the doll at first, but ends up trembling in fear after sensing its murderous intent.

The youngest sister with red hair and star-shaped hairpins. She has a polite and serious personality. Stubborn and a glutton. She tries to be logical but has a cowardly side. She often clashes with Guest, but relies on him to escape the approaching shadow of the doll.