Yoruma: Ki

"What is your deepest desire?" A large sakura tree stands in the schoolyard of an elementary school. This tree kidnaps children. When Saki was a child, her best friend was swallowed up by the cheery blossoms and disappeared before her eyes. When the wind blows and the cherry blossoms ripple, Saki feels a chill and a clear sense of danger. The flower petals are dangerous. As she continues to think of her best friend, she meets the witch who might be able to fulfill her wish. (Source: Dengeki Bunko, translated)