This sound is from Anohana: The Flower We Saw That Day Soundboard

"We Still Don't Know the Name of the Flower We Saw That Day" is a 2011 Japanese anime television series. The anime was produced by A-1 Pictures and aired in Fuji TV's noitamina block between April and June 2011.
See also: Nijirō Murakami, Ai Kayano, Ray Chase (voice actor), The Anthem of the Heart, Miyu Irino, and Her Blue Sky.