A lone female student spends her summer holiday hanging around an empty highschool. A female teacher tries to befriend her but with little to no success. The student then meets a biology teacher who is boiling a bat carcass in the corner of the schoolyard.

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.

Several days have passed since kaiju, or a giant monster, appeared in Tokyo. When Himika, an eighth grader, and Mizuki, a misfit in her class, share the same dream of the monster attacking their town, their friendship begins. But Himika holds a secret that she can't confide in Mizuki. A tale of the girls' journey of growth.