Inserting the CD-ROM of the Dreamcast version into a PC reveals a readable segment with a folder called "BONUS" containing various pictures of the female cast.

The galleries are different between regions. The Japanese gallery features Ayane and Kasumi wearing a kimono while the other three galleries feature pin-ups of Helena, Leifang, and Tina (the latter wearing cat ears). In the European version all the pictures are pin-ups with only sharing the Helena picture (albeit with a different background). The American gallery is pretty similar to the European one but with three extra pictures.
Contributed by ZpaceJ0ck0