It is revealed that, more than being Neiru Aonuma's Egg, she was her friend by the past. This character is the first Wonder Egg Girl to have been seen in the real world and even interacting with a protagonist when alive. As Neiru, she was born inside the corporation she worked in, called Japan Plati, which wanted to create individuals endowed with incredible intelligence and a high IQ level by the use of in vitro procreation.

The two girls never knew their parents personally, whose having been selected for their genes. Her genetic makeup is identified as extremely rare, presenting the characteristics of heterocromia, albinism and high intelligence at the same time. The unique aspect of those makes her body being the source of many researchers' interest, which will cause several problems at her death. Kotobuki Awano became both a scientist and a doctor and took the post attributed to Doctor Seki unintentionally. She then met Neiru, her only friend among the corporation.

(Source: Wonder Egg Priority Wiki)