If the Star Dome Train accidentally leaves the wrong station and crashes into the Taisho Era...
When an interstellar tourist group mistakenly enters the Infinity Train dungeon, and when an old acquaintance of a fertile creature encounters a monster that relies on eating people to stay alive, you can see: the Wind-up Ghost is pinned to the ground and repeatedly "iteratively optimized", the Lord of the Demon Slayer Team enjoys interstellar medical VIP services, and a certain unnamed former Oak family owner is trying to install a full-band communication module on the Ravenclaw.
In short, this is a story about "aliens helping local indigenous people beat up a thousand-year-old monster". As for who is quietly rewriting the script behind the scenes? Ah, full responsibility!
Purpose: Because the original work was too bitter, I wanted to give them a gentle touch