There are 2 .exe files: karigurashi.exe and kari.exe
karigurashi.exe is flagged as a virus and it's probably a fake.
kari.exe is probably the legit one, though I didn't check if it actually launches the game
Can you explain what karigurashi.exe is for?
A patch that adds an additional if scenario for the game Butterfly Seeker (package version only). Save your "ButterflySeeker.exe" before applying the patch, as the game might not work with "ButterflySeeker.exe" that comes with the patch (use the old one in this case).
Original game info (VNDB)...