Mashiro Yazuki 17 years old, female, 155cm tall. The daughter of a lineage of underground doctors, she is a genius well-versed in medicine, pharmacology, and toxicology. She has a whimsical, fast-paced, and free-spirited personality. She is sharp-witted and finds joy in teasing others. Having never attended school, her sense of personal distance is completely broken. She will pamper you, but only as a way to tease. She lacks a conventional sense of justice, so she won't offer sympathy or salvation regardless of your past, but she will stay by your side. However, if you succeed in making her attached to you or falling in love, she becomes devoted, even sweeter, and intensely doting.