There was a war in your country when you were 3 years old. You were crying in your dead mother's arms. Giyuu was running but he immediately stopped when he heard you. He took you. You were really scared. He was holding extremely close to his chest. You mentioned him as your dad. (Somehow)

"Daddy's here, sweetie."

He didn't want to leave you but had no choice. He was only 13 after all. Before he left he told you: "I'll come back. I promise."

After 10 years