Seri Dojima (堂島瀬里, Dojima Seri) is the older sister of Maki Dojima. The criminal siblings were sent to Haguro Prison after the death of Shion Magaki. Her inmate number is LB0002. Her "base" is one of the serial killer siblings, Gary Lewingdon, while her sister's "base" is Thaddeus Lewingdon. She and her sister got their personalities swapped when the Medusa Syndrome breaks out.