Nanami doesn't hate Kurofuku because he remembers her, but he also ordered her to show him breasts and vagina for money... soo... yeah.
Well, that explanation from Kuroha was pretty vogue, she now thinks they "papapa" together in Love Hotel...
What kind of comparison was that, guy wanted to be a veterinarian and they ordered him to kill animals so he quit, but comparing it to humans? Both is bad but experimenting on thousands of people for "greater goal" isn't justified. WTF?!?