After experiencing countless worlds, Mubai lost interest in traveling and came to the Collapse World (pre-civilization). Before arriving, he signed an unknown contract. Under the requirements of the contract, he could not interfere with the main process of the world (that is, the timeline of the pre-civilization, but the details can be changed).
When the contract was completed, the world changed, and things that did not belong to this world merged into it.
P. S. The contract was signed when the protagonist arrived, and it only exists as the core for activating the magic circle.
P. S. This book is a comprehensive comic book world (mainly based on the two worlds of Fate and Honkai Impact. The content of the subsequent worlds... I haven't thought about it yet, but it should be added in the modern timeline.)
P. S. I'd better use this introduction to introduce it to those who want to read it. (I won't write an introduction that attracts readers anyway.)
