Shizuku Tsukishima is a 14-year-old student at Mukaihara Junior High School, where she is best friends with Yuko Harada. Living in Tokyo with her parents Asako and Seiya, as well as her older sister Shiho, Shizuku is a bookworm and is keen on writing. During an ordinary evening, she looks through the checkout cards in her library books. She discovers they all have been checked out by Seiji Amasawa (天沢 聖司). Over the next few days, Shizuku encounters a young man, later revealed to be Seiji, who often annoys her.