The file doesn't use the regular Kirikiri 2 encryption. It's a data file from a cancelled game.

It uses encryption from https://type74.org/ed.php (specifically version 3.4) but I have no idea how to crack it. I tried to decrypt it with xor, but it doesn't seem to use xor. Not sure what encryption it actually uses.

Included a second file (ane1177.zip) as a sample of the encryption.

data.zip ane1177.zip

Edited August 27, 2025Aug 27 by calmevening

Even if you knew encryption method, you would still need to know a valid password to decrypt data.
You can try to hook or debug game's executable to get the password.

Also please read the forum rules! And please correct this topic's  title!

Hi. thanks for telling me; there's no executable, it was a patch file

Game was called Ane wa Ikkyuu Kenchikushi ~Ikenai Kouzou Sekkei~ (Aneken)

Edited August 27, 2025Aug 27 by calmevening