Nadeko Sengoku is an ordinary, carefree middle school student. One day, on her way to school, she encounters Ran Hokkyokusei, whom she soon discovers is a new transfer student. When Ran attempts to flirt with Nadeko, he is intercepted by Sui, her childhood friend, who claims that Nadeko belongs to him. Kimi to Nadekko! centers on Nadeko and the two boys as their rivalry and determination to win Nadeko’s heart intensify.