Kazunari didn't at all expect that the King would quickly agree to his demand. Right now, with all the Dreamers running rampant amidst the cities of Viomich, he knew that the country of Aznith is backed into a corner as well and there was no way the King would consent to his request.
But unbeknownst to him, his suggestion was actually the very solution the King was searching for. Now, he wouldn't have to worry about the country of Viomich bearing a grudge against them for not helping at all. Even though he only did the bare minimum, it's better than not doing anything at all. And with that, he also wouldn't be put in a bad light in front of the Dreamers, thus minimizing the likelihood that they would take over the country of Aznith. It was a brilliant idea.
When Kazunari got out of the meeting hall, he was then met with Miki and th others, who were eagerly awaiting the good news. Kazunari didn't waste any time telling them everything.
T__T