In the Emerald kingdom where humans live, the war with the Glome Empire where monsters live has been raging for 3 years
As the fires of war become fiercer, the Glome Empire starts to retreat and is faced with impending defeat, so they try to negotiate a ceasefire.
Negotiations for the ceasefire are carried out by both countries.
Negotiations continue with the advantageous conditions being for the stronger Emerald Kingdom, and the Glome Empire seems to be on its last legs.
At that time, the Emerald Kingdom receives a sudden attack by the Glome Empire, and the King is slain.
The Emerald Kingdom whose guard was down due to needing to negotiate the ceasefire could not fight back in time and the Princess was kidnapped.
The real purpose of the enemy was to kidnap the princess.