User blog comment:ヌヌハラ/alice-tools v0.2.0/@comment-45214281-20200313112813/@comment-44256294-20200327001853

Correct. Originally, those functions were stored in separate DLLs but at some point AliceSoft decided to just bake them into the executable.

Unfortunately I don't have a lot of experience with reverse engineering binaries, but what I might do is edit the game's code so that that the main function looks something like this:

; int main(void) FUNC 0x1234 S_PUSH 0 CALLSYS system.MsgBox CALLHLL Math Rand CALLSYS system.Exit ...

Then run the game in a debugger and see what code executes between the MsgBox and Exit.