The theme of this series is monster girls, which has a lot of info dumping on different races and their way of life. A lot of thought-provoking ideologies comes up in this series, clashing with what is considered normal to humans compared to what is normal to different races (this could be a downside depending on the reader). Aside from that, the protagonist is simply a man that wants a monster girl harem, honest and straight to the point. The story actually follows two different protagonists, so readers may have mixed feelings because they could hate one protagonist while loving the other protagonist and wantingto see that protagonist more instead.