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(+2)

Sounds like the save data got corrupted somehow, if you're on Windows you can go to "AppData/LocalLow/tian nya/WOWOWOW KORONE BOX" (you can go to your AppData folder quickly by typing "%AppData%" and exiting the "Roaming" folder) and delete "saveData.json" to reset. If possible, see if you can post the contents of the file here (use Notepad to open) so I can take a look.

(+1)

My "saveData.json" was empty, it was blank, I asked a friend who also had the game, what was in his and I understood everything. Apparently, my data got erased somehow. I deleted the file and launched the game and it worked properly, thanks a lot!