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.

As a member of her high school's newspaper club, Airi looks forward to the annual creation of the town's tourism promotion posters, but it gets canceled; to suggest an alternative project, she rallies her class for support.

The greatest crisis in the universe, involving all dimensions, is about to strike. The most formidable enemy, Gavan Killer, who aims to "annihilate all Gavans", pushes Reiji and his friends into an unprecedented life or death situation!