Massively convert koikatu sunshine chara cards to koikatu chara cards in one key
Place the py script or packaged exe file in the folder that conatains your cards going to be converted. Run the py/exe and it will automatically scan and convert KKS chara cards in the folder and its subfolders to KK chara cards. Converted result will cover original file so be careful. If necessary, modify the code or backup important cards.