In the early days of the earth, the rise of ethnic groups led to devastating wars. The earth is divided into many territories with the leadership of outstanding kings. Everyone wants to break the balance and annex the remaining lands. When the power of humans was gradually exhausted, the kings turned to ancient help by recruiting summoned beasts to accompany them in the survival battles. From time to time, these kings considered the companion Pet as a symbol of victory every time they went to battle.