Ressentiment - Corrupted Heroine Karen

Karen, a brave man who has mastered the power of light.

even though he was from a commoner, he was able to subdue many monsters.、
from the royal capital to the remote village……
she had no enemies on her way.――
The Demon King who was the opponent of this time was different.

for some reason, the power of light does not pass almost, and it meets in return……
Only one of them survives.

But while being tormented by helplessness, she did not give up、
I asked for help from the scientist"Eris", who is praised as a great sage.

So, what was presented was to throw away the power of light once and change the class to the dark attribute.
After heightening the power of darkness― the power of adultery-a hidden, equipped with the power of both light and darkness
Aim for a class.

However, it became a state called"darkness fall" in this world、
It was a dangerous road with the risk of falling into the act of Imbi.

―- Can Karen defeat the Demon King as a noble hero without falling down?

Or, to become famous as a nasty hero by falling without a shadow to see
I wonder if it will be......?