The Takeda Castle ruins in Asago City are known as the “Castle in the Sky” as they are located on a mountain top and look to be floating in the sky.  Wild cherry trees growing on the mountain slope are another symbol of the city. The trees, preserved over generations, have bloomed every spring for over 1000 years. This documentary follows a group of elders who maintain the trees to hand them down to future generations. When one of the group passes away, fellow members plant a tree with his family to also preserve his memory forever.