If you read the novel, Anna's characteristic is justified, but as someone in the past (forgot who) stated that the whole story is pretty much biased toward MC (a bit sidetrack from original waifu/mistress discussion) . In almost every arcs there is this 'deus ex machina' moment that just doesn't seem natural. It does allow the story to continue, but still... I don't think I remember a point where MC actually lose hard in battle or politics. Still, I like the story up to the very end where it got axed. The last 10-20 chapters are hard to read. Still, the English translation team did a pretty good job.