Kazuma Hoshino transfers from the city to the small mountain town of Yamahiko-cho so that his beloved, sickly younger brother, Ayumu, can recuperate. On his first day, Kazuma gets lost and is bewildered when a local girl, Hatsumi Nakatsugawa, appears before him. Hatsumi guides him to the school, but unexpected events await him, far from the peaceful country life he expected. What will become of his new encounters and turbulent school life?!