Talk:Recent Updates/@comment-2602:306:CFA6:4AB0:2CA0:BE06:59DB:D442-20180225171921/@comment-27593051-20180225193739

They were a daily log-in prize for 12 days for new year's campaign (omikuji drawing), so if you now have 11 including the 3 free ones, you missed some days.

Unfortunately there's no way now to earn more, and it seems they'll disappear from your inventory once the exchange seals campaign is over, so I suggest to use the ones you have for other items (especially letter sets for kiwame)