After spheres from the sky drop to the ground, military training begins for the students to ensure their safety. However, the students find it too demanding and have a difficult time. As students head to the shooting range to learn how to shoot, they get caught off guard and fall into a crisis. Meanwhile, a student getshuged by one of the spheres.
When mysterious alien spheres start invading the world, high school students are called upon to join the world's first war against extraterrestrial forces.
Duty After School - Military Training Begins Synopsis and Schedule