On Your Mark is a quasi-movie that has everything except words, and that's just the way it was meant to be. Being a little under 7 minutes long, you'd think that it couldn't offer much in the way of content, but it's simply a monumental achievement. The song "On your mark" by Chage and Aska is the only accompaniment to the masterful sound effects throughout the animation.
As with most anime, though, you may have to watch it multiple times to absorb all that's thrown at you, but since it's so short, this is easily done. The story follows two soldiers' experience after a raid on a violent cult headquarters. What they discover hidden away in the back, however, will change their lives and the way they think forever. You'll laugh at some of the sound effects, and maybe a tear will be shed with the ending. On Your Mark is of the caliber of such movies as "Macross Plus", and even better that "Mononoke Hime". One that should be remembered always.