Kyōsuke Isazu (伊佐津 恭介 Isadzu Kyōsuke ) is the head of Kiryu Hospital and the doctor in charge of Aiko Tachibana's care. Like Kurose, Kyōsuke was formerly a researcher at the Kiryu Biotech Research Facility. As one of the artificial life form researchers, he developed the "Carbon Nanostructure" technology. Yuzuha Isazu (Kyōsuke's only daughter) was in a coma following an accident and he struggled with his inability to find a way to treat her.
After the eradication of the Matter, he was left mentally traumatized from his control of the Malignant Matter. Isazu was left to recover under the care of Saho and his daughter.
|Main||Aiko Tachibana · Yuya Kanzaki|
|Divers||Daisuke Shinoyama · Maho Shiraishi · Yoshihiko Sagami · Kazuki Minase · Haruka Seri · Kaede Misawa|
|Supporting||Gummi · Hori · Kyōsuke Isazu · Yuzuha Isazu · Kiryu · Susumu Kurose · Akiko Nanbara · Nanami Ozanami · Saho · Original Aiko · Kōichi Tachibana · Royta Tachibana · Yumiko Tachibana · Toshihe Yura|