While traveling the wilderness, Mizuho asks Yamabiko how he became a dog. Yamabiko then relates how, 5000 years ago, he wandered different worlds all alone, until meeting a girl to whom he gradually opened his heart. But their happiness was short-lived.
and "Why didn't I do that?"
ولماذا لم أفعل ذلك؟
y "¿por qué no hice esto otro?"
E "por que eu não fiz aquilo?".