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Synopsis

Their mother leaves her husband and marries a younger man, Kouzou Akizuki. Marina adapts to the new stepfather, but Airi resents him for disrupting their family. She then discovers Kouzou is a sexual predator who collects and sniffs his underage stepdaughters' underwear and harbors plans to take their virginity. With their mother frequently absent, Kouzou is free to pursue his sexual urges. He creates a potent aphrodisiac and administers it to Airi; under its influence she loses control and succumbs to his perverse advances. As she becomes immersed in the illicit relationship, she falls deeper into sexual degradation. Emboldened by the drug’s effects, Kouzou continues to use it on others, forcing multiple girls into humiliating sexual acts to feed his desires.