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...
I guess it's because 
I made you worry, huh?
أظنّ أنّ ذلك لأنّني جعلتك تقلق، صحيح؟
Ach, ist wohl meine Schuld, oder?
Fui yo el que hizo que te preocuparas.
No, yo he hecho que te preocupes.
Enfin,
Anzi,
Acho que é porque eu fiz você se preocupar, né?
Видимо, я заставил
тебя потревожиться.