Unnamed Woman

She is the second person to be killed by Kitazawa and Takahashi.

Appearance
Her most noticeable traits she has is her malnourished her body is is possibly from being in the building for so long. The woman has long messy hair and is only wearing her bra and underwear.

Personality
She appears to be crazy as she laughs while attacking Takahashi but she has also shown some sanity when seeing Kitazawa and questioning her presence in the building.

History
The appearance of her body must mean that she had been in the building for a very long time. However, she seems to have a backstory with Kitazawa as she was shocked when first seeing her.

Plot
The woman is first seen watching Kotaro Takahashi when he is in the bathroom. She is seen mostly in the air vents as she watches him however soon she sets up a trap to lure Takahashi in. As he falls for it, she attacks him with a syringe only to gave her attention drawn to Ai Kitazawa. She appears shocked at seeing Ai Kitazawa which gives Takahashi enough time to kick the syringe out of her hand. Surprised, she tries to grab it before Kitazawa does. This scuffle leads to her being stabbed in the stomach with the syringe by Kitazawa. As she sees it she screams and runs away not wanting to melt. Her remains are then picked up by Takahashi and put in a box.