They really made the anime so much more towend down... It more indecated that the girls were intressted in the MC but he was too slow too understand and only sleept with the vamipre. Then I read this manga and I'm so disapointed.
It was actually kind quite good in the begining but then it all whent down hill when all the harem girls where introduced and they just keept on coming and he more or less emediently sleept with all of them... + the strange sister/wife relationship they all have and have no intressed in anyone else but the MC...
Isekai Nonbiri Nouka