WTF did I just watch?!

This seems like the most random sub-plot of an anime ever.
"Yeah, we´re making this anime about a boy who´s into zombies and who´s goal is to resurrect his dead cat. Oh, we´re also putting in this girl, who´s father shoots nude photos of her."
rofl
I mean, surely all of this will be relevant one way or another. But after that first episode, you just aren´t expecting such a seriousy incest-abuse sub-plot. This episode certainly changed my perception of this show and what I´m expecting in the future.