The sex is good when it isn't rape and there is a good deal of humor but the goal of killing the boy when the girls first come to earth is not so good. That kind of genre is not my cup of tea. Otherwise fairly standard humor hentai that is good kinky fun and good for amusement. The plot though could use a good bit of work. The girls were typical freak out girls when they get touched by a boy. That is hardly realistic. They also exhibit the typical anime girl cuteness and over violent reactions when angered.