After the death of her father, who was the assistant instructor, Hibiki was forced to lead her family's swordsmanship at a young age. At the school she went to, she was instructing her senior members as the head of the kendo club, even though she was only a first-year student. The members' morale was low, and with the tournament just around the corner, Natsume was fighting alone. Just then, Nakamura, a burdensome member of the club who was a gloomy person, found out Hibiki's secret and threatened her, gradually driving her into a corner...