There is truth in what you said, Sanae.Now that we've got the gist of it, we'll strike while the iron is still hot! Let's develop the barrier sign without delay!...Still.The key point here is youkai.
Things will be better if we can keep them away.In other words, we need a barrier that "Conveniently blows away only youkai and welcomes only humans".Since it's overrun with youkai, humans are scared to come here...Yeah! Let's blow them monsters into the Milky Way!Reimu, the person beside you is very much a monster herself...
