Oni Chichi ~Manamusume Kyousei Hatsujou~

Oni Chichi ~Manamusume Kyousei Hatsujou~(it can be translated as "Demonic Father: Stepdaughter Forced into Heat" in English) is a 2008 Hentai Visual Novel about a Mad Scientist who uses his invention to rape his own stepdaudghters.

Kouzou Akitsuki is a talented chemist married to Kayoko, an beautiful female teacher. Kouzou, however, feels nothing for his wife: his daughters are the children of another man, and actually he lusts only for late teenage girls. He engages on several perverted habits, like drinking his daughters' bath water or ejaculating on their shampoo, but never actually abuses them.

However, his current work is the development of an aphrodisiac substance, that he uses on his secret teenage lover Yuka Minami as a human test subject. After repeated uses of the drug on her, he is certain using them on a human subject will make them extremely lustful.

As a Visual Novel with multiple paths, the story will then diverge according to which of his beautiful stepdaughters Kouzou will want to use his devilish invention on: the kind Marina, who has fully accepted him as her father, of the feisty Airi, who thinks he is a criminal already despite the lack of any proof?

Developed and published by Blue Gale.


 * Abusive Parents: Considering he drugs his stepdaughters in order to rape them, Kouzou more than qualifies for this trope.
 * The Bad Guys Win: Airi's ending..
 * Bi the Way: Sana has sex with both men and women.
 * Bratty Teenage Daughter: Airi fits this to a T. She constantly berates the protagonist at every turn and thinks little of him. She is right he is a creep but she has no logical proof he is up to anything until he already has her cornered.
 * Double Standard Rape: Averted..
 * Hot Mom: Kayoko is beautiful and seems to be curvy as her daughters despite them both being teenagers.
 * Hot Teacher: Kayoko is a teacher and gorgeous.
 * Love Potion: One in format of spray, that seems to make the targets horny almost instantly and attracted specifically towards the protagonist, though they can still show signals of resistance at first.
 * Mad Scientist: Kouzou is a scientist that creates a love potion and uses them to rape and brainwash his stepdaughters.
 * Parental Incest: Kouzou lusts after his own stepdaughters.
 * Properly Paranoid: Airi is obsessively paranoid the protagonist is up for something and turns out to be right about it.
 * Rapunzel Hair: Airi's hair is ridiculously long.
 * Red Oni, Blue Oni: Airi is constantly angry and paranoid about Kouzou. Marina is always relaxed and thinks the best of her stepfather.
 * Schoolgirl Lesbians: Airi and Sana are on a secret lesbian relationship with each other.
 * Smart People Wear Glasses: Southern, a colleague scientists of Kouzou, wear glasses.
 * Victim Falls For Rapist: With repeated uses of the spray, the victims begin to develop feelings of love and even jealously towards the protagonist.
 * Villainous Incest: Kouzou violating his stepdaughters makes him even more heinous in his use of his aphrodisiac spray.
 * Villain Protagonist: Kouzou has no moral regards about using the love potion for self pleasure.