Stepmother's Sin
義母
(Gibo)
GenreEroge
Game
DeveloperGuilty
PublisherGuilty
GenreEroge
PlatformWindows
ReleasedFebruary 9, 2001
Original video animation
Directed byMiyako Mizuno
Produced byKei Miyake
Written byRokurota Makabe
Music byMasamichi Amano (Credited as Yoshi)
StudioDigital Works
Licensed by
Released October 5, 2001 January 11, 2002
Episodes2

Stepmother's Sin (義母, Gibo, lit. Stepmother) is a 2001 eroge developed by Guilty. Peach Princess published the game in North America.

A hentai OVA was produced by Digital Works and released by JVD months after the game was released. The same plot and characters were used.

Plot

The story starts off with Yusuke's Mother slowly stripped her clothes one by one in front of a bespectacled middle aged gentleman who quietly observed, showing her naked body to the latter who remained stoic and silent. The scene change to their foreplay where the mysterious man started groping the rich, enormous and beautiful breasts of Yusuke's mother to arouse her which he relished as he licked and taste her nipples for some time before he started fingering her vagina, as she started to feel anxious, the man reminded her she is no longer a virgin, and told her to relax a little more and enjoyed the foreplay which she complied.

The scene changed to a sleeping Yusuke having another memory of witnessing his mother's adultery where Yusuke's Mother is having extremely passionate sex with the mysterious man, Yusuke's Mother told her sex partner to hurry up and give her an orgasm as her husband is coming back, which the latter agreed but hesitated as Yusuke is in their house which Yusuke's Mother assured as she think her son is out collecting insects leading Yusuke to wake up in shock and sweat. After some time, where Yusuke's Mother is finally aroused, she gave the mysterious man a blowjob, with an unsatisfied expression told her to be more intense in her sucking and she must improved her sucking technique to prevent her husband from cheating on her. After licking his penis a few times, her teacher proceed to give her a cunnilingus, as he savoured her vagina, he complimented on its tenderness stating that he would never imagined it belong to a woman who had gaven birth to children, which Yusuke's Mother replied it is embarrassing and not to say such things.

As he licked further, Yusuke's Mother climaxed as she groped one of her own wonderful breasts. Slowly and gradually, in a missionary position, the mysterious man insert his penis into Yusuke's Mother's pussy, losing her chastity and having sex with a man for the first time after years. As the man questioned her how does it feel to have a receive a man inside her after a long time, she replied she don't know. As the coitus became more intense, Yusuke's Mother moaned in estactic pleasure first in a doggy style and then again in a missionary position.

Finally to maximize her pleasure the mysterious man in reverse cowgirl position, tightly groped Yusuke's Mother voluptuous breasts as he masterly and intensely thrusted his penis into her vagina to ejaculated inside her womb, he asked is the sex comfortable, she replied yes, as he ejaculated inside her pussy as Yusuke's Mother moaned very loudly.

We flash forward to the present day, and Yusuke’s father has been transferred to a distant office. Before he left, he married a new wife on paper but not in ceremony; Yusuke now lives only with his stepmother Misako and her daughter Shiina from a previous marriage.

After a brief toy and oral tryst with his cousin Mio, he contemplates his feelings for his new stepmother and women in general, while remembering the time when he first witness his mother's adultery as he heard his mother moaning in the house, he quietly peeked inside the room which to his heartbreaking shock, despair and dismay, his mother is having extremely passionate sex with another man in a doggy style position as loud sounds of copulation produced from the man's penis thrusting her vagina as Yusuke's mother immensely enjoying the adulterous sex and shown to have absolutely no remorse about cheating on her husband as she and her lover constantly moaned while her enormous breasts were bouncing energetically in unison. As the sex escalate at its most intense; the adulterous lovers climaxed in a creampie in absolute pleasure as Yusuke's Mother and her lover loudly moan with immense ecstasy as Yusuke watch on.

In his mind, they are all filthy nymphomaniacs; they may act innocent, but they will act like sluts if given the chance. This thought and hatred for his mother consumes him and drives him to exact revenge on womankind through his stepmother.

Unfortunately, Misako does little to prove Yusuke’s theory wrong as she quickly gives in to Yusuke’s devious seductions. The first episode ends as Yusuke begins to show his cruelty in their lovemaking. The second episode picks the action right back up with Yusuke coming up with more ways to humiliate his stepmother while gratifying his sexual urges.

Meanwhile, Shiina dreams of making love to her stepbrother. Unfortunately, her dream comes partially true as Yusuke forcibly takes her in front of Misako, humiliating them both. To make matters worse for Shiina is the fact that her mother ends up very aroused and begs Yusuke to take her. Shiina leaves for her grandfather’s place but ends up going willingly with three street punks; she lies back as they decide who gets her first thinking only of her mother’s actions.

One last tryst with his cousin Mio ends with Mio making Yusuke think about his actions. As he couples later with Misako, he realizes that he still hates his biological mother but has come to love Misako. He begs her forgiveness for his actions but receives a shock. She angrily rebuffs him and says that she does not care about his apology; she has grown to crave the rough sex he provides to the point where she cannot live without it.

Driven to a nervous breakdown, Yusuke runs off realizing that the true monster is not the woman Misako has turned into or women in general; instead, the true monster is himself, the creator of the beast Misako has become. These thoughts haunt him as he runs through a park eventually stumbling upon a couple making out. He assaults both of them and ends up crying on a park bench in despair and self-loathing until the police arrest him.

When the police bring him home, they find Misako engaged in an orgy; she sees Yusuke and begs him to come satisfy her needs. The scene shifts to the outside of the home as a struggle is heard. The last words we hear are "Stop, he's got a gun!" and then a single shot. It is left up to the viewer to decide which monster Yusuke has shot.

Main characters

Yusuke Yagami

The main protagonist, Yusuke, is a high student who is traumatized forever after witnessing his mother's adultery during his childhood. Thus, Yusuke held extreme disdain and hatred towards women. Desiring to vent his anger and hatred, he targeted his stepmother Misako abusing her as a sex slave.

Mio Shinohara

Yuusuke's cousin Mio is a high school student that goes to the same school as him. She is an honor student who enjoys being a class representative. She's got a calm, relaxed type of personality. She likes putting up a facade of being a "good girl" while in secret she has a hidden side of hers that loves sex. Unlike Yuusuke, Mio is sympathetic towards her aunt whose neglection by her husband in her marriage lead her to find solace in adultery.

Yusuke's Mother

Yusuke's biological mother, a very beautiful and attractive woman with long wavy brown hair and brown eyes. She possess an extremely voluptuous body with enormous breasts which remains untarnished even after giving birth. According to the OVA, despite her immense beauty, Yusuke's Mother was completely neglected by her workaholic husband for several years after their marriage. In an attempt to regain his attention, Yusuke's Mother sought the help of another man to teach her how to seduce her husband by learning to have sex in a skillful manner including foreplay techniques such as giving blowjobs, by having sex with her sex teacher. However, as time pass, Yusuke's mother came to enjoyed the tremendous sexual pleasure of their lovemaking becoming a nymphomaniac, eventually she became lovers wth her sex teacher. Yusuke's mother no longer cared about her husband as she had extremely passionate sex with her mentor daily without any remorse for her adultery, during one of her sex sessions, she unknowingly traumatized Yusuke who discovered her adultery by accident.

Mysterious Gentleman

The unnamed lover of Yusuke's mother. In the OVA, he is shown to be a bespectacled middle aged gentleman with a vigorous and powerful libido who is extremely skilled and experienced in coitus and giving women sexual pleasure. Having vast amount of sexual experience, he taught Yusuke's mother sexual techniques through practical experience, by letting him make love to herself extremely passionately. Yusuke's mother found a new unbreakable love in her teacher due to all the countless time he had spent passionately making love to her and the estactic pleasure that was born from their consensual coitus which is more than enough to satisfy the loneliness she felt from her husband's neglect.

Anime

A Hentai OVA adaptation was produced by Digital Works and released by JVD months after the game was released. The same plot and characters were used. The OVA also expanded to show and extended the scene of Yusuke's Mother committing her first adultery and explained her reasons for doing so as well as how Yusuke discovered his mother's adultery. The OVA also featured an original ending.

Further reading

  • Dong, Bamboo (9 March 2003). "Shelf Life: Bananas and Computers". Anime News Network.
  • Cruz, Luis (19 July 2003). "Stepmother's Sin". Mania. Archived from the original on 3 March 2015.
  • Beveridge, Chris (1 October 2010). "Stepmother's Sin". Mania. Archived from the original on 26 August 2014.
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