The Edo Period, the world of the samurai. The youth Narimichi, the son of a Shogun, who has thus always lived a very restricted life, and the wild girl Yu, spirited away from her mountain village as a baby and raised living free in the mountains. These two, whose circumstances are such that they should never meet, come together before the miraculous "lightning tree", and embark upon a doomed love affair. Knowing they will never be together, they seek all the more to go deep into each other's hearts. Since neither has ever been in love before, their encounter with it brings spiritual growth. For those of the modern age, far more free than that in which Narimichi and Yu lived, the film will express the value and wonder of love from the heart, without fear of being hurt. This is the story of a miracle of love, between two people who should never have met.