We see a lot of wild game concepts in this field, but Conception: Please Deliver My Child! is certainly up there with the best of them.
The PSP game mixes dating, child-raising, and role-playing in a scenario that has you saving an alternate universe from impurity by mating with 12 maidens of the Zodiac and bonding with the offspring. Those kids then join your party, so you literally conceive your own team of fighters. Check out the release trailer for Conception, which comes out in Japan this week, below.