The pests in the 3rd set of missions are getting stronger, only takes 2 hits to defeat a maxed evolved 2* girl, 3 for 3*. Or maybe because they have such low HP. I decided to keep at least 1 copy of my 2 and 3* and sell extra 4* to fill in these extra squads. Hopefully, I didn't waste so much coin upgrading them. These 2 and 3* might not cut it later on. Anyone know how many sets of missions are there for World Defense?

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And now that these missions are getting tougher, it's extremely frustrating after you do a mission 5 times and finally get 3 medals, but then it says "error has occured."