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.
The Woobie: A number of the cast to varying to degrees, but Tsukiko especially. Her father succeeded in a family suicide which left her as the only survivor and she was sent to her uncle's house, where she is raped repeatedly. Eventually she leaves him and finds another place to live, but the situation isn't much better. It is heavily implied she is raped regularly by random strangers and accepts all this abuse as penance for her father's sins.