I'm not sure about the exact plot as I haven't read it in detail. But generally, it might be about a hero who decides to stop fulfilling the role of a hero, perhaps due to some disillusionment or personal reasons.
Since I haven't read the 'I Will Quit Being the Hero Novel', I can only guess. There would probably be the hero himself who wants to quit. There might also be some friends or comrades who try to persuade him to stay in his heroic role, or who are affected by his decision. And there could be some antagonists who either oppose him because he's a hero or who take advantage of his decision to quit.
The plot typically involves a character who decides to leave the hero party for various reasons. Maybe they're tired of the constant battles, or they have different values from the rest of the group.
The turning point could be a major betrayal. If the hero was betrayed by their comrades or someone they trusted, it would make them lose faith in the whole concept of heroism. For instance, if their sidekick turned out to be working for the enemy all along.
I'm not sure where you can specifically find the 'hero i quit long time ago light novel'. You could try looking in local bookstores that have a section for light novels. Sometimes they might carry more niche titles.
I'm not sure what you want to know. If you can provide more information or clarify your question, I will try my best to provide you with the most accurate and useful answer.
The main character is likely the one who decides to quit the hero party. There may also be other members of the hero party who play important roles, like the party leader who might be shocked or angry at the decision. And there could be new characters that the protagonist meets after leaving the party.
The plot often involves the main character's decision to leave the hero's party. This could be due to various reasons like feeling unappreciated, having different goals, or being tired of the hero's journey. Usually, after leaving, the character embarks on a new path that might cross with the hero's party again in unexpected ways.
Perhaps the writing style changed. If at first it was engaging and then became too convoluted or simplistic, that would be a reason to quit. Also, if new elements were introduced that didn't fit with the original concept of the light novel, it could turn you off.