Premium Adventure (Yakuza 0)

I just recently noticed a premium adventure where the main plot is not affected, you can change clothes and change the cycle of day and night. The bad luck is that I played yakuza a year ago, and continued the passage just now. When I want to switch to a premium adventure, there is only 1 save, and it's from last year. Is there any way to transfer a modern save to the premium adventure save slots?