An extra in my hero academy

"What is that Deku?"
"...It appears to be an elf using quirks!!". Ater replied, with wide eyes!
...
This is the story of an extra in his favorite work, fulfilling all his wishes and exploring a super incredible anime world.
Or it should be like that, but it turns out that our protagonist discovers that this new world only looks a little like the story he knows, because with the arrival of mana and the synchronization of Earth with other ruined worlds, the story takes an incredibly new and mysterious.
Uncover secrets, and discover new personalities, if you can call it that, in this exciting story of action and adventure, which revolves around an extra, which won't stay extra for long.
.
.
.
This is my first work so I hope you like it, leave your reviews so I can improve, and support my work if you like it.
*There is no harem!
*Dominated protagonist!
*Light romance!
*Great secondary characters!
*Known villains and new villains!
*Lots of action!
*Exploration of the world, not just Earth!
*The events that will happen that differ from the original work will only happen after chapter 100. So support my work until then, because you will love the events!!!