A naive, well-endowed schoolgirl's search for her lost hat leads her into a house she assumes is deserted. Hidden inside is an unhinged man who watches her and becomes fixated on dominating her completely. Armed with advanced gadgets, he menaces her with death, bodily harm, humiliation and the erasure of her will and sense of self, bringing biological, chemical and even nuclear horrors into her new life under his control. Adapted from a three-volume manga by Noriko Nagano, the series mixes comedy, romance and science fiction with a premise that is unsettling one moment and almost comedic the next.