[DeepL Translation - needs review] Volume 1 Introduction: I love you. In her second year of high school, Kimi finds a letter in her desk in a mobile classroom that says just one word: "I love you. The sender was Setoyama, a popular boy at school. They are in the same grade but in different classes. Rimi knows him, but it is highly unlikely that he knows her. Kimi is puzzled and wonders if it is a prank, but she puts his reply in her shoebox. From that day on, their exchange diary begins, but...
