Setsu's unconventional mother, Sawamura Umeko, has suddenly descended and forced him to enroll at Umezono Academy. In helping to assemble a shamisen which has lain long disused, he meets Maeda Shuri, a girl in the same grade as him. While all this is going on, Setsu reunites with his older brother, who he hasn't seen in a while, and they play shamisen together...
♫ Ah, ah, saa ♫ 
♫ آاه، سا، سا ♫ 
Que commence la chanson
Ah, ah, saa, vamos começar.
А-а-а, а-а-а, мы уже начинаем.