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...
Koyabu-sensei.
.كويابو-سينسي
Frau Koyabu!
Profesora Koyabu.
Profesora Koyabu.
Mme Koyabu !
Professoressa Koyabu!
Koyabu-sensei!
Коябу.