Girl #10 Hirono Shimizu is a rebellious girl. In both the manga and novel, she has a history with prostitution and drugs, and sports spiked hair. On the island, Kaori Minami attacks her, but Shuuya briefly intervenes.
In the novel, Hirono shoots Kaori and escapes. In the manga, she shows interest in Shuuya's offer but flees after Kaori shoots her in the shoulder. Following this, Hirono uses all her water to treat her wounds. However, she develops septicemia and becomes severely dehydrated.
Attempting to get water from a well, she encounters Toshinori Oda, whom she shoots and leaves for dead. It turns out he was wearing a bulletproof vest and recovers to attack her again. In the novel, Toshinori strangles Hirono with a belt. In the manga, he pushes her down the well, where she drowns while experiencing a final dream. Her body is later found by Hiroki, who mourns her loss.










