The characters are two dimensional and the story has no structure, no resolution, and no development.
It's very sexual and odd and pointless. But, because I am a depraved, I love it.
There are three reasons to watch Pupa:
1) You love some cannibalism and violent horror. You also can't figure out what to watch next so you could use a horror "snack" of 4 min episodes.
2) You are tickled by the absurdity of some anime. The gratuitous violence and psuedo-sexual brother-sister relationship is hilarious. Watch with your friends, have a laugh, and/or make some gifs for your tumblr or whatever.
3) You've watched all the vore and sibcest hentai that you could get your hands on. Now you're searching for something to scratch that itch.
Pro tip: if the cannibalism isn't a turn-on, just listen to the audio and forego looking at the video. It's basically groaning and squelching with constant "Onii-chan" repetition.
