Army sergeant Yu Hoshijima has been tasked with looking after Sui, an alien diplomat from the planet of Lambda, for three months. On the first night of their meeting, Sui embraces Yu and confesses that he's been waiting all this time to meet him after a mutual event in their past. On top of that, Yu is stuck in Sui's tentacles against his will as he's asked to consider having Sui's child! Since Lambadian procreation methods make it possible for human males to carry children, is he really going to receive the seed of this alien man here and now...!?