Yuuko Amasawa

Yuuko Amasawa, nicknamed Isako, is a powerful hacker known as an encoder who can break directly into the code and infrastructure of the virtual world. She uses a Brain-Computer Interface to interact with that space and relentlessly pursues a special living metabug virus marked by a keyhole. Outwardly, she is arrogant, withdrawn, and inclined to view relationships as hierarchies of power.