Koishi just sort of blinked, tilting her head as Mikasa explained the world she was from. Her frown gradually deepened. That did not...

"What a cruel and wicked world. You did well for living so long in it. I would die in a world like that. Not just me, but all youkai. We depend on humanity to survive." She drifted closer, nudging her shoulder. "It's safe here though, okay? You don't have to be scared."

Her third eye drifted over, nudging Mikasa's shoulder gently. "You're very brave for protecting people though. And every place has people worth protecting too."