yea....Even if she has full-vit build, she should still take some damage instead of absolute nothing... o.o" It's too broken as one of those viewers said x'D But well..in the end it's fantasy and not an actual game, so anything goes with making stories :3
There used to be a game coming out, everquest next, that did something similar to this in terms of aquiring skills / classes. A real rpg made the way this anime is doing it, would be refreshing to be honest. Getting quite bored of the classic trinity, tank being weakest class etc type of gameplay(I play mainly tanks xD)
That is the joke. Nobody expects a tank going full defense can do anything but soak up damage.
Just go with it, this seems like a really fun and good anime, definitely in my top 5 this season. I'm curious to see what they'll do with it.