The government plants a professional seductress, Irina Jelavic, in Class 3-E as its new English teacher, betting her honey trap can do what the students cannot. Korosensei sees through the ploy at once, but the sharp tongued assassin's stay leaves a mark on the class no one expects.
A disguised Korosensei rescues a foreign woman from harassers near a shop, and she asks him for directions to Kunugigaoka Junior High. Karasuma soon introduces her to the class as their new English instructor, Irina Jelavic, and the students immediately notice Korosensei's attraction to her, which she plays to all morning with an endless stream of requests. She sends him off to Vietnam for coffee, then drops the sweet act to boast of her plan to kill him.
Her arrogance alienates the class, and Karma dubs her Ms. Jela-Bitch. When Irina kisses Nagisa to pry loose his notes on Korosensei's weaknesses, the room reacts with equal shock and amusement. Her first lessons are wasted on plotting rather than teaching, and after the repeated insults she retaliates by drilling the students on pronouncing a single letter, which they brand the lamest class ever.
Irina lures Korosensei to the storage shed and, pretending to undress, hides while hidden gunmen open fire. She emerges to find her henchmen knocked out and Korosensei untouched. He had smelled the unfamiliar men and recognized the trap early, playing along only to spring it back on her, and he punishes her by grooming her thoroughly to the whole class's earshot.
Humiliated and vengeful, Irina belittles the students for caring about exams over killing a planetary threat, then complains to Karasuma that she is an assassin, not a babysitter. Watching Korosensei prepare individual tests and seeing how much his methods mean to the class, she begins to reconsider. She returns to teach a genuine lesson on why real conversation matters in both assassination and life, and apologizes for her cruelty.
Won over, the class recasts her nickname as Bitch-sensei, a title she resents, while Korosensei predicts she will fit right into the assassination classroom. Karasuma suspects the whole arrival was Korosensei's design to secure the students an excellent teacher. The episode adapts three chapters, Breast Time, Adult Time, and Pro Time, and marks Irina's full integration into Class 3-E.

Naruto vs Luffy with the twist nobody asked for: Luffy tickled Hinata on date night, and she kind of liked it. We break down the whole fight and commit to a winner....

There are no women on Namek. That isn't an oversight, it's the biology. Why we handed Piccolo the one thing his own species rules out, and why it had to be trap soul....
In episode 4, Adult Time, Korosensei rescues Irina Jelavic from harassers while in disguise, immediately senses she is a government-planted assassin posing as the new English teacher, and later turns her own ambush trap back on her in the storage shed before publicly scolding her.
Irina Jelavic is a professional assassin the government plants in Class 3-E as the new English teacher, hoping her seduction skills can succeed at killing Korosensei where the students have failed.
The class quickly grows to resent Irina's arrogance and constant plotting instead of teaching, with Karma nicknaming her Ms. Jela-Bitch after she toys with the students and kisses Nagisa to steal his notes on Korosensei's weaknesses.
Korosensei smells the unfamiliar gunmen Irina hides in the storage shed and recognizes the trap early, playing along before turning it back on her and leaving her hidden shooters knocked out while he remains untouched.
Yes, after seeing how much Korosensei's individualized teaching means to the students, Irina apologizes for her cruelty and stays on, earning the class's respect under a new nickname, Bitch-sensei.
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