Ninja Kids!!!: Summer Mission Impossible (2013)

Rantaro and his friends have new mission when coming back ninja school. They have to a sword with a mysterious power called “Heaven’s Sword”. While nations are in the war, the sword which is said to give the power to its owner controlling the world is stolen. This power is the target of almost ninja all over Dokutake Castle and beyond. Rantaro and friends are assigned to bring the sword back. Mission starts.