Heroine Karen wields the power of light to vanquish her foes.
Despite her humble peasant upbringing, she now fells monsters,
and has made a name for herself that is recognizable all across the kingdom.

But her greatest foe is the demon lord itself…
And during the battle, her light powers seemingly have no effect.
Her party is wiped, and she barely escapes by herself.

Karen refuses to give up though, and seeks help from a brilliant scientist named Eris.
Eris’ suggestion is to abandon the light for now, and embrace the darkness.
As she increases her lewd power, perhaps a hidden holy class that mixes both light and dark awaits…?

However, in her now corrupted state,
she might also have trouble just making it through the world without giving in to pleasure.

Can she finish the deed she started, or will she lose herself along the way,
and become an infamous heroine of sluttiness?