These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Designated Hero: If Benika's plan succeeds, the Kuhoin family is more or less doomed to extinction.
Designated Villain: The Kuhoin "traditions", as sick as they seem, are what the family has to do in order to survive.
The plan also has not one but two very obvious failure conditions. One, The Kuhoin family can simply write Murasaki off as damaged goods and either abandoning or killing her. Two, they can just as easily break her spirit in such a way that she simply goes along with the tradtions anyway.