Kage grew stronger by collecting several blue stones and absorbing the mana within them over a long period of time. When his mana point reached 10, he evolved into a Stage 2 zombie. To test his new power, he went to Stage 2 zombies like himself.
However, the other zombies looked at him with disdain. Kage could not stand this situation and got angry by spreading his mana around, surprising the other zombies and quickly taking out his dagger and chopping them all. He is currently in Stage 2, but his power is equal to Stage 3 zombies, and since his mana point is 10, he summoned the zombie, which is his weakest summon. The zombie dead around merged to form a new zombie, and other zombies scattered around in fear.
However, since Kage had used up all his mana, he became exhausted and fainted. When he woke up, he saw a lot of dead zombies around him and did not understand what happened. Other zombies tried to kill him, but the zombie he summoned protected him. When Kage stood up, he couldn't see the zombie he summoned and started looking for it.
He found the still fighting zombie a few streets away and while walking towards him, the Stage 4 zombie jumped down and killed him within seconds. Kage had a fit of rage, picked up his daggers and added his mana into them, and Kage and the Stage 4 Zombie faced each other.
The Stage 4 Zombie attacks Kage using his fists while walking towards him. Kage uses his mana quickly. To escape the zombie's attack, he quickly jumps to the right and gets behind the zombie.
The zombie quickly turns back and attacks Kage, using his fists again. However, Kage uses his speed to approach the zombie and cuts off the zombie's arm with his dagger. Kage quickly takes advantage of the opportunity as the zombie quickly retreats and stops to check its arm.
Kage quickly circles the zombie and cuts off its other arm. The zombie has now lost an arm, and Kage uses his mana to accelerate further and pull out his dagger. While the zombie defends with its remaining arm to block Kage's attack, Kage quickly jumps towards the zombie and thrusts his dagger into the zombie's chest.
Kage watches as the zombie slowly retreats. While the Zombie's strength is still impressive, Kage has the upper hand thanks to his greater maneuverability and ability to think quickly than his fearless fighting. Using his mana, Kage predicts the zombie's movements and quickly moves towards the zombie's head with his dagger.
The zombie's defenses cannot block Kage's attack, and Kage cuts off the zombie's head with his dagger. As the zombie slowly falls, Kage quickly turns around and is ready to defend the other zombies with the dagger in his hand.
Meanwhile, Kage realizes that he has become even stronger against the destructive power of zombies, and by defeating the Stage 4 Zombie, he evolves into a Stage 3 zombie. His strength was almost as much as the Peak Stage 4 Zombie.
When Kage looked at the Stage 4 Zombie he had killed, he realized that he was standing in front of a system panel. The words "Can be resurrected" appeared on the panel and Kage paused for a moment when he noticed it. He bends over next to his dead body. She says "Resurrect" and transfers all the mana energy to his body. Suddenly, the man's eyes open. Kage approaches the zombie and says your name is now "Sirius".