If you read the first review on To Love Ru and Motto To Love Ru, I said the anime doesn't have a significantly great story and is very heavy on the ecchi (almost to the point it's called light porn), but the comedy is still a worthwhile watch if you have the time. It's the same deal on Darkness but now the plot has a general direction for the whole series and we get to know more about the more popular characters Momo and Yami.
