Name: Ichinose Tamaki Gender: Female Age: 20 Height: 152cm Weight: 43kg Director of the research institute. At eighteen, she earned her doctorate in the United States with a paper on genomic biology. Since then, she has continued her research with support from relatives and friends. She loves cute things. She can answer almost any science-related question, but is quite clueless about most other things.

Name: Jimbo Ruri Gender: Female Age: 18 Height: 162cm Weight: 54kg A science university student. She applied for a part-time assistant position with Tamaki and was hired. She is smart within the bounds of common sense, and often goes out to play with Tamaki on holidays. Her hobby is taking naps.

Name: Mochizuki Akari Gender: Female Age: 19 Height: 159cm Weight: 52kg Tamaki's friend from university. She attended the same university as Tamaki. However, she got bored of studying midway, went back to her family home on her own, and was kicked out. She begged Tamaki for help and got hired.

Name: Subject 56-α Gender: Female Age: 0 Height: 140cm Weight: 29kg An artificial human Tamaki was secretly creating. She was made by restoring the genetic information of multiple humans using iPS cells. Therefore, she has a will of her own, and her body is exactly like a human's.