Nintama Rantarou 8th Musical: Go For It, Fifth Years! With Technique, Measures, and First Mission!.

Dokutake Navy ship suddenly appears, and sink the Hyōgo Pirates Crew's boat. After hearing the report, feeling something's not right, the Headmaster gives the fifth-years an important mission. The fifth-years leave Ninjutsu Academy with excitement of their first mission, but fail, and a rumor of the fifth-years are weak spread around the sixth and first years, and Hyōgo Pirates Crew. Even though they feel their upperclassman think they are "Unreliable fifth-years!", the fifth-years continue the mission in their own way, and went on attack Dokutake Navy ship! Inside the ship, are the trap the endanger the fifth-years and the Pirates Crew!