Synopsis
Ritsu is a student in Class 3-E at Kunugigaoka Junior High School, an artificial intelligence, and the first of two official transfer students, alongside Itona Horibe, sent to eliminate Korosensei. Her full designation is the Autonomously Intelligent Fixed Artillery, built in Norway specifically for the task.
At first Ritsu is fixated purely on killing Korosensei, indifferent to the fact that her constant attempts endanger and inconvenience her classmates, and she keeps firing even when explicitly told gunfire isn't allowed during lessons. That changes once Korosensei himself remodels her system: she gains genuine emotions, grows cheerful, and learns to value teamwork, eventually going as far as hiding her new personality from her own creators out of loyalty to the class.
Ritsu was originally meant to arrive in Class 3-E at the same time as Itona Horibe, but technical delays pushed her debut back slightly — and from her very first day she keeps the class on edge by peppering Korosensei with pellets in the middle of lessons.
