Chizuru swallows hard, but she's turning to look at Saitou even before he speaks - and when he says her name, she nods slightly, her expression a little flustered but mostly determined.

"...we're going to save him. Whatever it takes... I'm willing to do it."

Souji is depending on them, after all. He watched them go knowing his life was in their hands, and he allowed it - that weighs on her more heavily than anything. She absolutely can't betray that kind of trust (even if it was reluctant on his part), and she certainly can't let her own discomfort or insecurities be the reason his life comes to an even earlier end.