Ookina Furudokei is a single-episode music video set to the Japanese version of My Grandfather's Clock, the 1876 song by the American composer Henry Clay Work. This is the third release of that Japanese version to air on NHK's Minna no Uta program. Ken Hirai sings it, and the visuals are artwork by Masaki Shiota, brought to life by the animation studio Three-d.