Rachnera Arachnera (ラクネラ・アラクネラ, Rakunera Arakunera) is an Arachne and the sixth girl to move into Kimihito's household (the fifth to officially move in). Due to their fear of her, her original host family sold her to "Mr. Director," who used her webbing to make money. Due to this abuse, she developed a hatred for humans. However, she changed her mind after kidnapping Kurusu and learning that he is a decent person who does not discriminate against non-humans.

Rachnera is an attractive young woman with short lavender hair, her bangs draped across the right side of her face. She has six red, pupil-less eyes and fangs. Her most notable physical feature is her lower body, which resembles a large spider with a skull depicted on its abdomen.

She has black armor covering her arms below the shoulders and glove-like fabric coverings on her hands, ending in pointed nails. Her fingers are also quite long.

Her outfit consists of a black tank top with a large slit, revealing the lower half of her ample breasts and her entire waist. It is sleeveless at the shoulders and features gold frills with short white lace. She also wears a long black loincloth with gold frills along the edges, covering the area below her stomach. In other episodes, she wears something resembling a white blouse.

All characters are over 18 years old!