Fushidara Sei no Oujisama

One day, a suitcase crashes into the ground in front of college student, Terano Jin. Pike, the boy who's sleeping in it, is an alien who has come to destroy the earth. To stop Pike, Jin must show Pike something more fun than destruction. However, no matter what he tries, nothing works. "Let's have sex!" Will sex and love be able to save the earth?!