After the duel with Takaoka on the southern island, the relationship between the 3rd-year E class and Mr. Koro (voiced by Fukuyama Jun) has become closer. Although the assassination activities are still going on, it seems that this has become an important part of the interactive play between teachers and students. The students represented by Kaede Kayano (voiced by Aya Suzaki) have begun to plan more exciting assassination traps. In addition, they help Mr. Biki (voiced by Shizuka Ito) pursue Kasuma Yoshiomi (voiced by Tomokazu Sugita), or sharpen their knives to fight the elites of Class A for honor and dignity. At the same time, Mr. Shiro leads Horibe Keiinari (voiced by Megumi Ogata) to make a comeback, and the mysterious god of death pushes Class E into a dangerous situation. As the deadline approaches day by day, the relationship between Mr. Koro and his students becomes more and more subtle... This film is adapted from the super popular manga by Yusei Matsui.