Kitaro had never really spoken with his classmate, the nice and proper Ms. Segawa, before. To his surprise, she suddenly confronts him one day out of the blue. Why? She claims she's seen an alien! And that alien is none other than their mutual classmate, the cute and popular Ms. Sakuma. Sure, Kitaro thinks, right. An alien. But is she telling the truth? Is there more to this mystery, or is it some elaborate prank?