Sextra Credit

Sextra Credit(Mejoku) is a 2004 Hentai anime, based on a visual novel by Love Juice.

Juutarou Saworu is a teacher on an average high school. He used to be very respected for his peers and have a high degree of freedom, but the previous principal's sickness put the school under the rule of the "Fearsome Five", a group of beautiful but stern teachers which bully and mock him all the time and question his teaching methods. When it seems student council president Minamo has been snitching him to that group, Saworu snaps and rapes her, but Minamo discovers his identity and in anguish confess his love for him.

Minamo quickly put his rape behind her and tells him he should drive the "Fearsome Five" away. Soon after Saworu starts his revenge after those teachers, using of pretty sexually depraved methods.

Animated by Studio Y.O.U.C and produced by Digital Works. Directed by Daifuku Suginami. Licensed by Kitty Media for the English language.

Tropes used in Sextra Credit include:

Anti-Villain: Untimely, Juutarou and Minamo are this. Most of their acts are illegal but their victims are jerks or rapists. Juutarou eventually even spares Kyouko of any retribution because the relationship between her and Yuuma is romantic and he doesn't want to ruin a couple similar to him and his girlfriend.
Bi the Way: Miki, Kaori and Minamo all feel sexual pleasure of sex with men and women.
Cannot Spit It Out: Minamo was in love with her teacher Saworu for a long time, but it is not until he says he thought he was spying on her that she can confess she loves him, and by this point he already have raped her.
Chekhov's Gunman: Yuuma is introduced earlier in episode 2. Though his friendship with Saworu seems insignificant at first, turns out to be fundamental on his plan to get revenge on Kaori.
Despair Event Horizon: Juutarou crosses it when he discovers he had raped a student that actually had a crush on him, but Marimo quickly pushes him back by stimulating him to commit revenge against the "Fearsome Five".
Disguised in Drag: Yumma disguises as Marimo to trick the male student Kaori sent to rape Marimo into thinking he is attacking the real one.
Disproportionate Retribution: The plot-triggering event is the protagonist raping his love interest for supposedly snitching on him.
Dude Looks Like a Lady: Yuuma is very feminine looking.
Establishing Character Moment: Kyouko scaring off a group of bullies beating up Yuuma quickly establishes her as the Token Good Teammate of the "Fearsome Five".
Girlish Pigtails: Miki is very girly in acting and voice and has shoulder-length pigtails.
Hot Teacher: All members of the Fearsome Five to one degree than the other.
Hypocrite: Mayumi is a very strict teacher that likes to lecture Joutarou on morals. Turns out she is much immoral than what he was when making said lecture by having sex with several of the students of her swimming class, something he calls her out for.
Kick the Son of a Bitch: Kaori is the worst of all of Joutarou's victims, a rapist herself which planned to get Marimo raped by one of her victims and forces her lesbian lover Rui to have sex with men because that gives her pleasure. It is basically impossible to feel sorry for her for falling into the same fate, especially considering she chooses it instead of going to prison.
Lady Macbeth: It's Minamo which spurs Juutarou into blackmailing and raping the "Fearsome Five" to drive them away.
Luminescent Blush: Several students, both female and male, react this way to Miki masturbating right in front of them.
Meganekko: Juutarou is a male example before raping Minamo. This is justified for the other teachers bullying and mocking him into submission.
Motherly Side Plait: Averted for Minami, which isn't motherly in the slightest to her students.
My God, What Have I Done?: Juutarou have a moment of this after discovering he had raped Marimo under wrong pretences, but she forgives since she has a crush on him anyway.
Not So Different: Discovering him and Kyuko both romance students, and she wasn't raping Yuuma as he thought, drives Joutarou to not even target her.
Pay Evil Unto Evil: Joutarou's modus operandi. How bad it is what he commits depends on the scale of the victim's offences.
Rapunzel Hair: Kaori's hair reaches her waist and goes beyond.
Skewed Priorities: Mayumi is much more worried that Marimo will leave marks on her skin than, you know, the torture itself.
Teacher-Student Romance:
- Joutarou and Marimo. She had a crush on him, that he mistook for spying, culminating on him raping her. Discovering the real reason, Joutarou however is quick to love her in retribution.
- Kyouko and Yuuma have a kind of Rescue Romance, as she scares off his bullies and dotes on him.
Too Kinky to Torture: Mayumi moans in pleasure from Minamo's whipping and cares more about the state of her skin.
Victim Falls For Rapist: Averted. Minamo was already in love with Joutarou before the rape happened.