Back to the Past: I Have a Star Rail Anywhere Door

(A Honkai: Star Rail fanfic that doesn't quite fit the traditional mold) [Honkai: Star Rail]+ [the Myriad Worlds]+ [Anywhere Door]+ [No Female Lead] (The story is mainly set in Honkai: Star Rail.) How about trading with a clerk for the blueprints to a high-energy battery from the start? How about an Anywhere Door that comes with its own cheat? Su Hao somehow returned to the past and found himself back at the beginning of his college years. Not only that, he also bound himself to a miraculous Anywhere Door System... There's no need to explain a life with cheat powers. For now, it only connects to one world, but that world has limitless potential... Technology far ahead of its time, mysterious and inscrutable Aeons, friendships that span worlds... Su Hao is fascinated by all of it. But while we're alive, we never know whether tomorrow or the unexpected will come first... Reality isn't as wonderful as games make it out to be... Did his friend's death give Su Hao a firmer resolve, or an unknown curse? Su Hao doesn't know either. All he can do is try his best to do everything within his power... Just an Aeon walking the wrong Path, that's all! An Aeon? Nothing special. I destroy you. What does that have to do with you? (One slash of the sword, and Nanook falls!) (The chapters at the beginning are a little slow. Be patient and read to around chapter thirty, where the plot reaches its first climax~)