Onoda Aki, Sobue Ryou, and Inohara Yuuta, are childhood friends attending the elementary school. They investigate the Shinto shrine in the island cave, where they meet Fureru, a yellow tailed hedgehog, and adopt it as a pet. When they touch each other and hear their inner voices, they are caught by Fureru's magical power within the fur. In the aftermath, they can "no longer…