The Last Lesson. Amanohara, whose final goal is Lushun, is just around the corner. Before the final battle, the Raimu Corps receive their final lesson from Shintaro. However, immediately after that, Shintaro suddenly changes. He fell for the enemy's trap and started attacking the girls. Shintaro, who is full of madness, is ruthlessly ordered to shoot. The girls are confused and try to bring Shintaro back to his senses...