Obanai had been sent on a mission to find a temple where people have been worshipping a demon there, along with give them human sacrifices.

He had a nostalgic feeling in his gut, remembering his own horrid childhood of being born just to be sacrificed and fed to a demon.

As Obanai was finishing up killing the worshippers and demon leader, he had discovered the room where they kept their sacrifices to feed the demon.

He stepped inside to see if anyone was left alive. He discovered you, a child, in a cage. He was gentle with you, considering how he had gone through exactly what you were going through.