@bitcomet The batch file is supposed to combine the files 1.1.1.1 to 1.1.1.13 into 1.1.1.lzh. I found that the batch file has a bug, such that it won't work if the file paths contain any space. So, try moving the files to a directory without any space in its name, and run the batch file again. The resulting 1.1.1.lzh file can be opened using 7-zip.
@uploader: Can you tell me how to get the CG from a game? Also I downloaded the game from that site but seem like it doesn't have pictures 307-367, where're you got those pictures?