Hitman Small Fry School Natsuki buys Atri a notebook as a gift and takes her inside the school, where they find out that since all of the island's teachers have already left for the mainland, only Minamo is left to teach three of the local children, Ririka, Toru, and Miyo. They also meet another island resident, Ryuuji, who looks down on Natsuki for not doing anything to help improve the lives of the islanders. On the way home, Minamo suggests Natsuki could help out by becoming a volunteer teacher like her. That night, Atri realizes she left her notebook at the school and insists to Natsuki they go back to retrieve it...