I/O
Criminal（I/O）
A hacker team led by Ishtar.
Sakuya Kawahara (I/O)
Takes care of Hinata's childhood friend.
Aoi Yumezuki (I/O)
Hinata's twin sister, who disappeared two years ago.
Hinata Aoi (I/O)
One of the protagonists investigating the mystery of his sister's disappearance.
イシュタル（I/O）
Leader of the hacker team Criminal and also one of the main characters.
Mayumi Shinozuka (I/O)
Codename R/Al, she is the twin sister who joined together with Masami.
I/O
A sci-fi suspense adventure game developed by Regista, it begins with a total lunar eclipse in Tokyo in 2032 and a computer anomaly. High school student Aoi Hinata, searching for his missing sister, programmer Ishtar, and other protagonists investigate from their respective circumstances, gradually piecing together the full story of the case from different paths.
I/O revision II (Windows version)
The Windows version was released on August 29, 2008.
Masami Shinozuka (I/O)
Codename L/El, a rising member of Criminal.
Mika Ayase (I/O)
A member of the Criminal codenamed Magdalene.
Kosuke Miyata (I/O)
Codename Eques, the only male member of Criminal.