Desc: Nintama Rantarô: Natsuyasumi shukudai daisakusen! no dan: Directed by Ryuta Tasaki. With Seishirô Katô, Soubee Amako, Roi Hayashi, Ryuhei Higashiyama. At a time when nations are warring, a sword with mysterious power called "Heaven's Sword" is stolen. The sword is said to give its wielder the power to conquer the world. Various ninja all over Dokutake Castle and beyond also manuevering for this sword of immense power. Rantaro and his classmates are assigned to retrieve the stolen sword, their first real ninja mission.