Assassination Classroom: Irina Jelavic (Episode 4)

This is from her debut episode in the first season where she was ordered by her boss to kill Koro-sensei but instead became a part-time foreign language teacher in Class 3-E. She is an professional hitwoman due to her seduction techniques to kill her enemies while they're distracted by her beauty. She hates to be called Professor Bitch from the students in Class 3-E due to her last name soundly like "bitch" instead of "vic".