is it possible to copy your save from pc and also the other way around?
Yes! Save and config files are located here:
Windows: C:\users\(username)\AppData\Local\UserData\Default\Lust Doll Plus
Mac: \Users\(username)\Library\Application Support\Default\Lust Doll Plus
Linux: \Users\(username)\.config\KADOKAWA\RPGMV\Default\Lust Doll Plus
(May need to sudo nautilus if you don't have access to .config)
Android: \data\data\indivi.indivigames.lustdollplus
(Requires root access)