In a modern Tokyo, a group of people who have died suddenly find themselves trapped in a sinister game that challenges the laws of life and death. Among them are Kei Kurono, a selfish and solitary young man, and his former schoolmate, Masaru Kato, who tries to maintain hope amidst the chaos. They soon discover that they are being controlled by a black sphere, which forces them to participate in extremely dangerous missions where they must fight terrifying aliens to earn points and perhaps the chance to revive or gain freedom.
The first mission leads them to confront a group of horrifying monsters on a dark, rainy night, and they quickly realize that survival is not just a matter of combat skills, but also of trust and teamwork. As they fight for their lives, the relationships among the characters intensify: some reveal their true nature, while others find redemption in the midst of chaos.
With a mix of fast-paced action, stunning visual effects, and thrilling twists, the group of protagonists faces challenging moral decisions and personal dilemmas that make them question the value of life itself. As the missions become more difficult and the stakes higher, the struggle for survival transforms into a deep exploration of humanity and purpose in a world where death is lurking around the corner.