About the whole "System" genre

It isn’t the first, but the systems in other stories were primary in virtual games

I was firmly disappointed going through tower of god when they started to introduce a million side characters which is cool and all but they all seemingly had plot armor while literally climbing a tower of death. Jyu viole grace never loses anyone important to him and it’s just like come on. This isn’t doctor stone (pretty good series btw) it’s suppose to be this deep emotional story and characters do conflict but it always resolves before it got anywhere. And the story is about this betrayal thing but the world itself feels fake even though they’re trying to sell the story off.

Which is really disappointing because Baam had alot of potential, he’s this seemingly a pure kinded person but his betrayel seems to have changed his skills rather then his actual character. Not traumatized not anything, he’s this same pure kind hearted person. No twisted sense of justice or anything. He could had been this really still kind hearted person but with a twisted sense of justice that made people question the morality of the situation.

I'd say the original Anime Higashi no Eden (2009) pioneered the concept. In that one the system was physical, though, and in the form of a phone, where you could talk to the system and have it do anything for you. From killing someone in front of you, to doing memory wipes. Pretty much anything was possible.

Then the RPG-Fantasy anime got popular and systems were mostly the familiar RPG leveling and skill systems.