Also known as: 石馬戒厳
An eighty-two year old Soldier who appears in the eroge Hanachirasu by NitroPlus. Ishima has the appearance of a small girl with long, Black Hair, wearing an Imperial Japanese Army Military Uniform and she fights with a Katana.
Ishima is a parody of Katou Yasunori, appearing as an antagonist in Teito Monogatari.
The voice actress for Ishima is Hokuto Minami.
Ishima Kaigen appeared later in the Nitro+ 2-D fighting game called "Nitro+Royale: Heroines Duel". At Ishima's end of the game, or rather her ending itself, is a Voice Actor Connection.