Mayuko Nise

Mayuko Nise (二瀬 真由子, Nise Mayuko) is one of the people transported to the mysterious skyscraper world. Bullied and neglected by everyone, including her parents, Mayuko behaved like a merciless killer in this new world, unwilling to trust anyone. However, after being saved by Yuri Honjo, Mayuko devotes herself to helping Yuri.

Age: 16
Gender: Female
Birthday: June 19th
Haircolor: blonde
Eyecolor: green in the anime, brown in the manga

(Source: Wiki)