Its a feature on the DMM version of the game. You can find it in the exchange shop. Its pretty much what it sounds like - a ticket that gives you a 5* with a slight chance to get a 6*.
The difference is - you can obtain this ticket via grinding (quite....the... loooong... grind, that is).
But in a short explanation its something like this:
Boss fights > Equipment seeds > Equipment > Turned into Special infusion points > traded for Danchou Coin > a set amount of Danchou coins traded for Danchou Ticket > A guaranteed 5*(+) ticket pull.