Hmm:
+50 per day from that monthly card pack
+15 per day from the wishing tree
+30 per day from convoying (that one is tricky though)
+5 per day from Nine tails event (there are too many beasts in my server lol)
(i leave whatever amount I won from the group lucky wheel out of the math, since i once got 5 ramens repeatedly lol); special events, arena, ninja recruiting and plot chapters rewards aren't accounted for either.
So they sum up to about 100+ per day. You could try plundering for greater coupon income though.