Plus drops
Vibe Fighter Plus members get a new cosmetic every month. Subscribe that month and it is yours for good.
A new item every month
Every month one cosmetic drops for Plus members. It is a different item each month. The Plus card in the Store shows this month's drop on a live stage, and says whether it is already yours.
Yours for good
If you are subscribed during the month, the drop is yours for good, even after you cancel. If you were not subscribed that month, you cannot get it later. Log in during the month so the drop is added to your account.
And the rest of Plus
Plus has other perks too, like no ads. The Plus card in the Store lists everything.