User blog comment:CureHibiki/Photokatsu Help!!!/@comment-24997848-20171214075849/@comment-24997848-20171214082543

Oh well to simply 3 as much as I can, the lettered tickets allow you to vote for your favourite unit that is available within that round. Depending on how many tickets you have, that is how many times you can vote. Voting for "B" has opened yet so I guess you can just save up your tickets until it begins.