Bio/harem

You are Y/n L/n, a normal human boy who had a loving family with your childhood friends Zoey and her sister Emerald, but then a group of the empire's soldiers lead by Ogre attack both your family and Zoey's and Emerald's family, killing both your fathers and mortally wound both your mothers and plan to force themselves on them. But what happens when three alien hunters kill the group and take in the three human children to train them their ways.