Anna Shroeder is a second main character of Project Arrhythmia.
Anna is the daughter of Till Shroeder - one of scientists, who was worked on "Project Arrhythmia". Suddenly, she died from Tokyo Flu and her mind was placed in supercomputer by her father. Now she's trying with Hal to find all answers about it and resist A.I., who is trying to erase her for cleaning memory.
Frivolous, not serious about things. Despite the fact that she is in a critical situation, Anna tries to find time for fun, and does not like when Hal "...always work work work (⋟﹏⋞)".