Here's a save file that has cleared the game, right at the Amon fight, just as a note this isn't a 100% complete file. I have posted a guide like this for all the other Yakuza, Like A Dragon and Judgment games. Links to all of them can be found here and on my profile. The links can be found here and on my steam page:
https://sp.zhabite.com/sharedfiles/filedetails/?id=2689025548
https://sp.zhabite.com/sharedfiles/filedetails/?id=2585769811
https://sp.zhabite.com/sharedfiles/filedetails/?id=2586740791
https://sp.zhabite.com/sharedfiles/filedetails/?id=2379715518
https://sp.zhabite.com/sharedfiles/filedetails/?id=2389968624
https://sp.zhabite.com/sharedfiles/filedetails/?id=2408950501
https://sp.zhabite.com/sharedfiles/filedetails/?id=2440359743
https://sp.zhabite.com/sharedfiles/filedetails/?id=2447367563
https://sp.zhabite.com/sharedfiles/filedetails/?id=2864943075
https://sp.zhabite.com/sharedfiles/filedetails/?id=2872921349

Saves:
https://drive.google.com/file/d/17_GFvGMpGOvOBRDmjyj5gacUJBB-53LT/view?usp=sharing
https://www.nexusmods.com/yakuzakiwami/mods/219

Please rate and favourite if these guides have helped you! Awards are nice too but not necessary.

Amon save is in slot 40, Finale Legend is in slot 41, I'm not sure exactly what the other saves are but they are included just in case anyone wants them.

After downloading the folder, unzip it using 7zip or winrar, inside is a folder called yakuza Kiwami saves open the folder and copy the files, go to where steam is installed and click steam, userdata, [your steam ID], 834530, remote and paste the files there. I recommend backing up your own saves, just in case. You might need to turn off steam cloud for Yakuza Kiwami for this to work, to do that, right click on Yakuza Kiwami in your library and go to properties and you will see a tickbox under steam cloud in general. For the Amon save file, which is save slot 40 he's right in the middle of theatre square, good luck, kyoudais.