Seiko is a bio-engineering prodigy and one of the top minds in the field of science. She can be cold and blunt at times, and has far superior intelligence than the rest of the population. Reiko, on the other hand, is the results of Seiko's work. Despite being a clone of Seiko, Reiko was considered a "failure" by Seiko's standards. Having both a vastly different personality and an appearance that doesn't match Seiko's ideal, Reiko was relegated to a side projects at best.