They should at least reduce the price to upgrade one girl to max to 200 Rainbow Medals. It would still be expensive but not as bad as it is atm.
I mean you get any Rainbow for 300 Medals...400 Rainbow Medals for just upgrading one girl is too expensive.
Anyway the timed Ultimate Maps (690k recommended power) are hard as fuck xD. I was able to beat the first map. The second Map destroyed me.
That Boss ignores Debuff Mechanics lol. Bye Bye Kerria OP Strategy i guess