「国がほしいのか？ならば、一国をお前にやる。」

これが、雁州国延王、尚隆と、延麒・六太とが交わした誓約だった。

民らが、かつての暴君によって廃墟となった雁国の再興を願い続ける中、ようやく新王が玉座に就いたのだ。それから二十年をかけて、黒い土は緑の大地にと、生まれかわりつつある。

しかし、ともに幸福を探し求めたふたりのこどもの邂逅が、やがて、この国と王と麒麟と民との運命を、怒濤の渦に巻き込んでいく！

"Do you want a kingdom? If so, I'll give you one."

This is the promise between Syouryuu, Emperor of En, and Rokuta, Kirin of En.

The Emperor was enthroned among the people's wish of reviving En, the kingdom that was turned into ruins by the former tyrant. After twenty years, the charred land returned to lush green and flourished once again.

Everything began with the encounter of two boys searching for happiness. However, the Emperor, the Kirin, and the people of this kingdom were soon engulfed into the rampant maelstrom once again!