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A fictional student idol group featured within the anime and manga series 'Assassination Classroom' (Ansatsu Kyoshitsu).3-nen E-gumi Utatan, often shortened to 'Utatan', is a pop idol unit formed by the students of Class 3-E at Kunugigaoka Junior High School in the 'Assassination Classroom' universe. The group was created as part of a school project and gained popularity within the story. The members consist of the entire class, with Nagisa Shiota, Kaede Kayano, and Yuma Isogai typically serving as the main vocalists and front-runners during performances. Their music serves as a light-hearted contrast to the class's primary mission of assassinating their alien teacher, Koro-sensei.

• The group was formed specifically for the 'School Festival Arc' of the series as Class 3-E's project to compete against other classes.
• Their debut song, 'Seishun Satsubatsuron' (青春殺伐論), translates to 'Youth Killing Theory' or 'Theory of Adolescent Carnage', ironically juxtaposing the group's cheerful idol image with the class's assassination mission.
• Within the anime, the group achieves significant popularity among the student body, showcasing the hidden talents and teamwork of the Class 3-E students.
• The songs performed by Utatan are real songs released commercially, sung by the voice actors of the anime characters. They were composed and produced specifically for the anime.