Shou Takamatsu is the main character. He is in the 6th grade and is a notorious prankster.
Shou is noble and brave, and rather selfless. He consistently refuses to sacrifice anyone for the good of the rest. Even though he started the story by fighting with his mother, he loves her a lot and frequently cries out to her. He is good friends with Ikegaki and Otomo, and later becomes good friends with Sakiko, Gamo, and the other officials.
Shou keeps a track of everything that happens in a notebook in the hopes that it will be found someday and help solve the mystery of what happened to the school and its children.