Did not mean that.... I actually meant this:
"The Caligula Effect was developed by Aquria and published by FuRyu. It was directed by Takuya Yamanaka, with character designs by Oguchi. It was written by Tadashi Satomi, who had previously worked on the first three games in the Persona series – Revelations: Persona, Persona 2: Innocent Sin and Persona 2: Eternal Punishment. "
So not P4, but P and P2. This has nothing to do with the publisher.