Kaiba's heart lurches when he hears that. He's so familiar with the feeling Idia's expressing. He's felt it himself so many times. The pain is undeniably part of him now. But there's another feeling bubbling to the surface, and that's what he ends up voicing.

"You're right. It hurts. It feels pointless. I want to stop caring. But...I can't," he ends up admitting. His voice is uncharacteristically quiet. "I still care. I take what I can and I deal with it. Whatever you think."