Lei Che was originally an ordinary human being, but his peaceful life was completely shattered when Destrudos ravaged the earth, and his mother died in this disaster. After unexpected rebirth, he became the monster King Red, and was bound to an infinite evolution system.
In this world protected by Ultraman and frequented by monsters, humans regard him as their enemy, and Ultraman Zeta also attacks him. At the same time, the mysterious dark forces of the universe secretly planned to send out mechanical beasts and shadow legions in an attempt to collect energy and resurrect the evil Ampera aliens.
Lei Che struggled to survive in a desperate situation, using the abilities given by the system to continuously evolve. He devours monster remains to gain evolution points, unlocking magical skills such as humanoid mimicry and energy countermeasures. In the process of fighting side by side with Natsukawa Haruki and against the dark forces, a shocking secret gradually emerged: his rebirth seemed to be a key part of the dark forces' conspiracy, and behind it was inextricably linked to the death of his mother.
