A goldfish in a tank, taken care of only by the protagonist, dies, and only then do the students feel sorry for it. In this world, people will be kind to you only when you die. Anne, ignored by her classmates, attends classes on the verge of breakdown, but when she meets Aina, who feels the same way, she smiles again.
Naito Naito, a second-year high school student who has the ability to survive in any situation, teams up with Ryuo Soya, a talented boy whose father is the head of the Ryuo Group conglomerate. Along with others, they challenge "Area Z," a game created by a genius known only as "Kurii Eita." Can they complete their mission to save the city within 6 hours? An original story based on the characters of Hayamine Kaoru's mystery novels.