Arakawa

荒川

She is a young researcher in her mid-20s and Professor Kakuzawa's partner, working alongside him to develop a vaccine to counter the threat of the Diclonius virus. She and Kohta inadvertently discovered Professor Kakuzawa's severed head, and she warned the boy not to disclose anything he saw or heard to anyone else. Afterwards, she reported her finding to Director Kakuzawa at his compound facility, but he would not let her go scot-free after seeing his son's horns. Chief Kakuzawa threatened her to take charge of his deceased son's research or else be killed.
In the anime, Arakawa is a minor character whose role provides little or no contribution to advancing the plot, as she is later often seen complaining that being so busy does not allow her to take a shower, which becomes a recurrent gag in the series.
However, her character eventually plays an important, key role in humanity's salvation in the last story arc of the manga.