"Ape God, start!"

"You refuse to laugh, and you refuse to die. It's hard for me to handle, isn't it?"

"Use duels to bring smiles..."

Fusion. Synchronization. Excess. Connection.

Four summoning methods, four worlds, four dragons, four identical boys, and four accompanying girls. They all interact with each other.

In the dimensional war, in order to protect that girl and everyone's smile, a duelist named Yuya Sakaki embarks on a journey across four dimensions.

Like two poles of light, they drew arcs across the sky and rainbows: the boy had become the demon king that the mediocre had hoped for, while the girl fought him as a brave warrior.

The love and hate between him and her is like the pendulum of the soul - never ending.