When Sanpeita Kobayashi was a child, his lovely friend had to move away, but she vowed that in ten years, they would meet again—as husband and wife. Ten years later, Sanpeita is a high school student, but he hasn't forgotten the feelings they shared. Sanpeita awakes from a dream about his last day with her, only to have his morning interrupted. A weird robot girl is battling other robots in his bedroom, claiming to be his wife. The robot's pilot looks like none other than Sanpeita's long-lost, childhood friend. But who is she really? Why did she have to leave? And what does she have to do with the Mishima Electronics Corporation?

The "summer supernatural teen comedy" revolves around an ordinary high school boy named Takashi who ends up living with a space alien's spirit (uchūjin no yūrei) after a strange incident. He names the creature "Uchurei" and plans to keep it as a pet, but becomes possessed by it. (Source: ANN)