This book is also called "Soman: The Demon King Who Started the Naruto World"

[No system + multiple worlds + no qualifications to become Kamen Rider + multiple heroines + Demon King + OOC apology]

My name is Tokiwa Sougo, but I am not the little devil king, nor the old devil king. I am Tokiwa Sougo who traveled to the world of Naruto. I had no inheritance and felt that my life was over. But when I was just five years old, my complaints were heard by the old devil king, and I got an unexpected inheritance.

Tokiwa Sougo: I'm not a knight, I'm a demon king.

Ordinary people practice diligently and become cannon fodder. Geniuses learn from the sages and stop at the limit. Peerless people learn from the world and create their own way. Monsters feed on all things and stand alone on the top of the mountain overlooking all living things. Jinguji: Flesh and blood are weak, I don’t want to be a human anymore. Extraordinary physique, secret skills, magical methods are all plug-ins, they will explode when you kill monsters, load the plug-in, and ascend. The first world is Yijiquan (one beats a thousand gold, muscle girl, fist wish)

Makino, who was terminally ill, accidentally carried the Soul-Eating Tree seeds with him through the Devouring World and took over the body of a cosmic-level warrior who had just experienced a life-and-death battle with a giant axe.

After killing the enemy, the Soul-Eating Tree can absorb the enemy's soul and show all the enemy's memories during his lifetime, including his understanding of martial arts, domain, and laws, to Makino.

After completing a thousand life-and-death battles, Muye chose to enter the battlefield outside the domain, where countless enemies were waiting for him to kill - or be killed...

The non-Earth chapter begins, the timeline is before the start of the original work, and the realm starts from the cosmic level.