Although her inmate number is "LB0008", Yoko was not the eighth inmate at the Haguro Prison since the eighth to arrive was Miina Isurugi.
- Among those in the Haguro Prison, Yoko is the last to have her murder model revealed. She was also the first one to experience the Medusa Syndrome.
- The alternative romanization of her name is Youko Kuroki. However, in inside cover of Volume 3 the author has revealed that her name is written as Yoko Kuroki.
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