Nadeko Sengoku, a typical and lighthearted middle school student, has a chance encounter with Ran Hokkyokusei, the new transfer student, on her way to school. As Ran attempts to charm Nadeko, her childhood friend Sui intervenes, asserting his claim over her. In the midst of this love triangle, Kimi to Nadekko! delves into the escalating competition between the two boys vying for Nadeko's affections.