Oni Chichi 1 Episode - Season 1

The narrative originates from the adult game "Oni Chichi ~Manamusume Kyousei Hatsujou~" by Blue Gale. Marina and Airi, two sisters, saw their mother divorce and later remarry a younger man. Marina is accepting of this new stepfather, but Airi harbors a strong dislike for him. Unbeknownst to them, his true nature is that of a pervert who secretly sniffs their undergarments. He aims to claim the sisters for himself through the use of a specially concocted love drug, designed to induce a state of intense sexual craving. The plot advances when Airi returns home and discovers her classmate, Sana, performing oral sex on him. He seizes the opportunity to spray the drug on Airi. With both sisters now under the influence of the substance, he gains the power to fulfill his desires with them.