|School||Hiiragi Academy's Main Campus|
|Manga Debut||Chapter 73|
Nami Shirakawa is a student of Hiiragi Academy's main campus. She is shown to follow the principal's laws to a tee; a persona that has given her the nickname "Machine Girl."
An emotionless rank D girl and the personification of Arisu’s prison ideal for the main campus; brain-washed to follow every command Arisu forces upon her.
She first meets Junichirou when she shows him a photograph of Mukyou Reiko; trying to find the run-away to bring back to the main campus. After a confrontation between the principle and Junichirou however, Nami is forced into a basketball game against Reiko to which she is defeated, but for the first time in her life, finding the duel to be “interesting,” and wishes to play another with Reiko at the expense of getting Arisu angry at her for showing even a hint of defiance. As punishment, Arisu takes away most of her points, and demotes her to Rank E which, as a result, leads to Junichirou challenging Arisu for her job as the principal of Hiiragi Academy.
Alongside Reiko, who she is now good friends with, they form a sports team soon after known as White Princess, and join up with Junichirou as his first children after he and his five chosen students appear before them when they are threatened by Team Titan. Since then, she follows Junichirou along on his main campus escapades and acts as his secretary; keeping Junichirou up to date as to how his Silver Core team is doing regarding the SS group war.
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