When the invasion was inevitable, a group of people were ordered by the emperor to go to the legendary Killing Tower. In order to protect the country, protect the people, and quell the chaos, they put aside their personal grudges, climbed to the top of the tower, and found weapons to defeat the enemy.
The Killing Tower is easy to find but difficult to enter, and easy to enter but difficult to ascend. Some people died on the way, and some people reached the top of the tower.
And what then? The people you love want to kill you, the people you trust also want to kill you, and what you think is the truth is not the truth.
The world is neither as beautiful nor as bad as we imagined, it just has more coincidences and helplessness.