Shinkyoku Soukai Polyphonica: After School

Originally released for PC (Windows) with the same title on December 2009, the port to PS2 was done about a year later following the port to a PSP couple of months after the PlayStation 2 port. While the original PC game isn't an adult novel, the console and handheld ports still do more than just port the game and include additional content and graphical tweaking to present the game on each of the devices better.

Aside from obvious graphical updates, the new content that was not present in PC release include:

New CG event scenes by Noboru Kannatsuki (神奈 月昇)

Full voice-acting for all characters, not just the lead ones