Now extermination of youkai isn't a big thing. But in those times, when spellcards didn't exist yet, it was different. The implicit rule established was "Youkai must sacrifice someone to continue to exist".

I thought, no, I was convinced that this couldn't be helped.

I was, until I saw the first sacrifice.

The first victim, who was exterminated by the miko of Hakurei, and whose corpse was trampled by youkai-hating people,

was a little child,

who was very well known to me.