I promise you that
The moment Hinari heard Sei's words, she looked at him and for the first time, she didn't feel the fear that used to feel when she was around him. She could see the sincerity in his eyes and with just that, Hinari could tell how much he cared for his little brother.
Somehow, the extreme pain in Hinari's heart seemed to slowly feel soothed. Knowing that Zaki needed her and that everyone was fighting for him made her smile despite the tears still rolling down occasionally from her eyes.
Now that she finally knew the truth, now that she finally knew what was really going on with Zaki, how could she ever leave him now?