This is the second game released for this manga (the first one was released on dreamcast)

The game models are in the PAC folder and in the MODEL.PAC file, but the file didn't extract normally,
you need with a hex editor change the value at the offset 800 after the letters "MM" from 36 01 to FF 00.
then use rrunpack and it will extract.
The models are in .yobj format and can be extracted in .obj format with rroexporter.

You can view the .obj file with Autodesk 3dsMAX or any other 3d model program.
The textures are in mtp2 format, a special type swizzled of tm2 file.

To extract the .PAC files you need this program: