Board Thread:Love Live! School Idol Festival Lounge/@comment-26529791-20150625003841

i honestly have no idea and all the Q&As and forums i've been on, nobody asks about them. i honestly don't now what to do with them. i have over a million and if i can spend them on anything that'll up my rank/idolize memebers/get me more cards, i'd like to know please!!

sorry this is kind of a dumb question, but i honestly don't know what i'm supposed to do with the coins 