Capriccio

A high school student has long been in love with a classmate but has never confessed. Meanwhile, a being from space, traveling alone, lands on Earth to complete a mission of expanding her species. The student is knocked down and later discovers a chain with a spiked ball around his neck. The ball transforms into a large, talking sphere with eyes and a wide grin. It is a space princess who wants to mate with him to reproduce her kind. Though he is confused and refuses, she transforms into a human-like figure to try to persuade him. He is uninterested, especially since he wants someone else for his first experience. They are connected by a chain that cannot be removed until she becomes pregnant.