Testament from Basho House - Glodia

After I reach the "EXIT OK!" in the first level of Testament I have to pop in the second disk and it's "The End". The manual and the stuff that's left in the videoram tell me that there must be more levels in this game. It has nagged me for years. What am I missing (except for half a brain)?

Don't know, never came so far :) But it looks strange that on disk2 is only an end demo ?