Stepmother's Sin

Stepmother's Sin (originally Gibo) is a 2001 Hentai anime based on the Visual Novel Gibo by Guilty.

When Yagami Yuusuke was a little boy, he witnessed his mother having sex with a man who was not his father. Not shortly after, his father also discovered this, and divorced her and took his son. Years later, his father re-married to beautiful widow called Misako Yagami with a daughter, Shiina. However, the experience Yuusuke went through had changed him: he had become extremely misogynistic and saw all women as depraved. Soon he entrusted himself with the mission of corrupting his stepmother somehow to prove himself right.

Animated by Studio Y.O.U.C. Produced by Digital Works. Licensed by Central Park Media and Critical Mass Video for the English language.


 * Arranged Marriage: Yuusuke's father marriage with Misako is said to be purely commercial, though Misako isn't rich, so this must mean more exactly public image.
 * Becoming the Mask: Yuusuke ends up do having an Oedipus Complex for Misako as they become closer instead of only pretending.
 * Bitch in Sheep's Clothing: Yuusuke pretends only to be a confused, hormonal teenager to Misako, only revealing his cruel colours to Misako when she has already crossed the line and is trapped between keep doing things with him or ruining her marriage.
 * Book Ends: The series begins and ends with Yuusuke watching his mother have sex with someone that is not her father. This pushes him through a murderous edge as he feels trapped in a cycle, but we never see the outcome.
 * Brother-Sister Incest: Shiina lusts after her own brother. Which makes no less traumatizing when he rapes her.
 * Conspicuous CG: Used several times to show liquids flowing, and even a curtain.
 * Downer Ending: No matter how you interpret the ending, it is this: even if someone was only injured or even the shot missed, Yuusuke has committed a horrible crime, Misako became sexually corrupted by him, and Shiina became a doormat which accepts having sex with strangers who hit her at the street. Their family life is ruined beyond salvation.
 * Extreme Doormat: Shiina becomes one in the end, so traumatized by Yuusuke's rape who she is willing to go alone with strange men to an hotel to have sex, presumably to stay away from Yuusuke.
 * Gainax Ending: Near the end of the hentai anime, we see Yusuke being brought home by the police only to see Misako and the three guys she previously had sex with. Suddenly, a gun goes off, leaving questions as to whether Yusuke shot his mother or himself.
 * Gone Horribly Right: Yuusuke wanted to prove Misako was a "slut". He did prove himself right. That also happens when he begins to feel genuine feelings for her, so he is traumatized again.
 * Hey, It's That Voice!: You'll never hear Yami "Yugi" Moto the same way again after hearing Dan Green as Yusuke.
 * Hot Mom: Both Yuusuke's biological mom and his stepmom, which is the biological mother of Shiina.
 * Kissing Cousins: Yuusuke maintains a carnal relationship with his cousin Mio, but it seems nothing more than that.
 * Oedipus Complex: At first, Yuusuke pretends to have this to press Misako into sex. And then later, he feels actual more filial love towards Misako as he has more sex with her, mixing it all together.
 * Parental Incest: Yuu and Misako commit several acts of incest, and she is his stepmom.
 * Primal Scene:
 * What cause Yuusuke's deep resentment towards all women, watching his mother have sex with a lover when he was only a child.
 * Shiina ends up watching her mother lusting after and having sex with her own rapist in Episode 2.
 * Sexy Discretion Shot: We never see what happened to the woman in the park, but she seems fine afterwards, so Yuusuke probably didn't go far with her.
 * Unwitting Instigator of Doom: Yuusuke's mother accidently created a rapist and maybe a murderer depending on your interpretation of the ending. Yuusuke definitely was going to try to kill Misako (or himself) at least.
 * Your Cheating Heart: What also annoys Misako about having a carnal relationship with the protagonist is being a married woman cheating on her husband.