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Oni Chichi (鬼父) is a series of hentai OVAs that are based off the PC eroge series Oni Chichi developed by Blue Gale. The series follows the exploits of two families, mainly the family of Airi Akitsuki (秋月愛莉). The sex scenes can be highly explicit, and there are scenes of rape as well. This anime series is intended to be viewed by adults only.

Plot
Marina and Airi's mother had divorced few years ago and got remarried recently to a young man named Kōzō (孝三). While Marina accepts her new stepfather, Airi (愛莉) detests him. Kōzō, who is a chemistry professor at the girl's school, is actually a pervert and develops a drug that has a side effect of making women highly aroused. He tries the drug on Airi's friend Sana (his niece who secretly likes him) and it works. When his stepdaughter Airi brings her friend Sana (紗奈) over they find out that it will be just the three of them together that night. Airi decides to go shower quickly and comes downstairs and finds Sana giving Kōzō a blowjob. He then uses the drug on Airi, who eventually becomes addicted to having sex with him. Kōzō finally targets his remaining step daughter Marina (真理奈). She is an honor student and has a boyfriend named Masato Ono who she feels she loves very deeply. They finally decide the time is right to have sex, however her stepfather isn't willing to give up taking her virginity that easily. Airi will be both a hindrance and a help to her father here, but in the end he gets his way. The next day Marina discovers that her boyfriend cheated on her with Sana. At the end of it all Kōzō finds himself with three young girls all addicted to having sex with him.
 * Oni Chichi (鬼父)

The story is about a Kenichi Makino (牧野健一 [father]), and his four daughters Haruka Makino (牧野遥 [eldest daughter]), Natsume Makino (牧野棗 [second daughter]), Akira Makino (牧野晶 [third daughter]), Fuyu Makino (牧野ふゆ [youngest daughter]), who just a week earlier had been in a car accident that took the life of his beloved wife. He blames himself for his wife's death and now has to take care of his four step daughters. Kenichi finds himself thinking perverted things about his four lovely daughters. Among the daughters Akira loves him a lot but she hides it. On the other hand, Natsume hates him and almost every man because she feels she is always repressed for being a woman so Kenichi decides to discipline her and make her feel like a real women by breaking her. When the rebellious Natsume gets into trouble at school, it's time for daddy dearest to administer some discipline of the sexual variety. Soon, he's giving the same treatment to motherlike Akira, over-achieving Haruka, and sickly Fuyu. Whether they want it or not.
 * Oni Chichi 2 (鬼父2)

Here we return to the story of Kōzō and his daughters. Airi still loves her stepfather, though he treats her more like a sex toy than anything else. The story starts with Airi bringing her stepfather and her friend Sana to go see a romantic movie. While her stepfather and Sana fall asleep rather quickly Airi enjoys the movie, that is until a man sitting behind her starts sexually assaulting her. As the movie ends the man disappears and Airi, trying to prove that it wasn't the man who aroused her, takes Kōzō to the women's restroom where Airi give him a torrid kiss and a blow job. Just as they are about to have sex the man from before reappears and drugs Kōzō. Now without anyone to defend her, as Sana can't do anything but stare from outside the restroom, Airi is raped by the man several times in several ways, though he claims to be simply showing her a 'new world'. The next day both Sana and Airi discover that the man who raped her is actually a teacher at their school. They both confront him separately about what he did to Airi; both of them end up having sex with him in his office. At the very end of the story it is revealed that Kōzō had known about the entire plot and had set it up with the other professor so that he would have sex with Airi and Sana.
 * Oni Chichi Re-birth (鬼父Re-birth)

Airi is mad at her stepfather after all he has put her through on the past months, because he uses her as a sex toy whenever he wants. He, with the help of his other step daughter, Marina sets a trip to a hot springs resort to make up to her. Later, she makes last minute plans and just lets the two of them to go. Since his habits are very hard to change, from the very first moment of the trip he constantly tries to drug Airi to use her as his sex toy. In the end, Airi confessed that she likes it but just coats it with a tsundere attitude while she is enjoying the trip. She also expresses her concern that her stepfather only likes her when she is being drugged. Later, Marina appears and finds Airi and her stepfather together in bed, neither of which can remember after having a hangover. While Marina has sex with Kōzō, Airi is out in the hot springs but inexplicably comes back with a slight fever. When she starts addressing Marina as "mama" it's revealed that she suffers some kind of memory loss. The rest of the trip is now spent with Marina and Kōzō indulging in sex while Airi acts as their daughter more than anything.
 * Oni Chichi Re-born (鬼父Re-born)

This series returns the story to Kenichi Makino and his four daughters from Oni Chichi 2, whom he continues to have sex with whenever he pleases. One day, the girls head to the wilderness on a trip, and their father uses this opportunity to anonymously rape Akira and Fuyu for his own enjoyment. This scares them as they aren't willing to have sex with anyone other than their father, but they are relieved when he reveals his identity. Later on, Natsume catches her father having anal sex with Akira and flees when she is almost spotted. The episode ends with a large dark figure appearing over Natsume, scaring her. It was believed this figure was a bear, however it was actually a policeman. Kenichi abuses the situation to trick Akira and pretends that a stalker sends him mails, supposedly forcing him and Akira to have sex in exhibitionistic ways. The one sending the mails is actually Natsume, but since she messes up and sends a mail to Akira by accident, both have a confrontation about it. Akira plays along for a while, then takes Kenichi hostage with the help of Natsume and Fuyu. The episode ends with Akira and Natsume having sex with Kenichi, who's wrapped up, and then punishing him by turning him into a kendo practice object.
 * Oni Chichi 2 -Revenge- (鬼父2-REVENGE-)

The latest series of the Airi storyline finds the three main characters adjusting to their current setting of an open adult relationship. The setting is completely disturbed when Airi and Marina's mother, Kayako (華代子), returns and seeks to "rebuild" her relationship with Kōzō, unaware of him having sexual relations with her two daughters. Also Kōzō gets more and more abusive to Airi who has been challenging their relationship with another young lady. The episode ends with Airi and her stepfather being caught in a sex session supposedly by Kayoko. The school also obtained pictures showing Marina walking into a love hotel with a partially hidden man that appears to be Kōzō himself.
 * Oni Chichi Rebuild (鬼父rebuild)


 * Oni Chichi Refresh - (鬼父 refresh)

Aired August 17, 2015. Airi, Sana, and Kōzō go on vacation. Kōzō manipulates Airi into numerous exhibitionist displays, and the hot lifeguard who keeps looking at Airi eventually confronts Kōzō he has seen them. He denies this. It ends with a cliffhanger of Airi almost drowning and a mystery someone saving her.