Based on a more careful observation of the trailer and what nutaku has said before, it seems like a lewd version of a type of game which is LOA2, ninja girls, girls x battle and others better games i suppose (again, pardon my ignorance). Assuming that it is, basically we spam missions to get items to upgrade the girls then duke it out in ranking. In other words, some fun with a side of pay to win. It should be decent though.