Marina and Airi's mother divorced several years ago and recently married a young man. Although Marina accepts her new stepfather, Airi hates him. She knows that he is actually a pervert, that he sniffs their underwear and wants, to turn them into his property by making a love drug that will turn Marina and Airi into hungry whores. When Airi comes home and notices her classmate Sana giving him a blow job, he uses the drug on her. Now he will do whatever he wants with them.