About the Song
Yuuki 100% (勇気100%, Courage 100%) is the opening theme of Nintama Rantarou, aired on April 10, 1993 by Ajia-do Animation Works Studio. It is sung firstly by a Japanese band Hikaru Genji, followed by other performers such as Ya-Ya-Yah, Hey! Say! Jump! and many others, and composed by Kouji Makaino. The anime itself sets on ninja era and features the adventures of Rantarou, Kirimaru, and Shinbei in ninja school.