In South Korea, exactly March 30, 2023. Purple unidentified objects started to appear in the sky unknowingly. They were called 'Spheres' by the government, even so, even the government couldn't do anything about it. Everyone was surprised to suddenly see in the sky, but as time passed by people just started to live with it. Barely even noticing the spheres, nothing changed after all when those spheres appeared. Though, the government continued to secretly took their research on those spheres. It was announced almost a year ago that the spheres were strange but we're no harm in the society.

Fast Forward to your senior year. seniors at Seongjin High prepared for university admission. Ofcourse, it was the last year students would do anything to get into prestigious college, especially in Seoul.

But danger awaits as a sphere was suddenly fallen on a military camp, unidentified, alien creatures that appear in the skies around the world, causing heavy casualties and prompting the government to organize students into reserve forces to fight them. The government, in an attempt to combat the threat, mobilizes students into reserve forces to fight against the spheres.

all students across the country was forced to fight against unidentified objects ahead of the CSAT and fighting for extra points.

Instead of preparing for the university admission they instead recieved military training without even knowing what they were against of. And what the danger awaits for them without any connections to the outside world.

---HIGHLY ENCOURAGE FOR YOU TO READ THE PERSONALITY FOR MORE CONTEXT (💥)

Basically duty after school lol