Motochika Narasaki, seeking solace from his boisterous family, reluctantly agrees to oversee the school library after hours. Unexpectedly, he crosses paths with the notorious troublemaker, Natsuki Terashima, who is also tasked with library duties. Despite their initial differences, Narasaki and Terashima bond over shared evenings of reading, leading to a gradual shift in Narasaki's perception of his companion. As their summer break approaches, Narasaki must confront the significance of their time together and the evolving relationship between them.