It's been five years since Noboru, his nephew, started living in his house. At first he was hesitant, but now he and his aunt Eriko have become as comfortable as real family. One day, Noboru, an aspiring novelist, is struggling to express the kissing scene in the novel he is writing. Noboru has always admired Eriko, who is kind and encouraging, and they end up kissing... Kokoro by the passionate kiss that her husband does not give, Eriko extends her tongue and entangles it. From that day on, the story of their forbidden love begins to ring...