This is a story about revenge (seriously).
She transmigrated to another world and rose to the throne of the Demon King as a succubus.
After becoming Demon King, she set out to conquer the world with a bunch of useless allies, only to have her grand venture collapse halfway through and end up as a shooting star streaking across the sky.
And then...
Serena came back to life.
Having returned to square one, she reflected on her painful failure and figured a few things out:
"If hard work doesn't help, then I'll lie flat and wait for a powerhouse to carry me!"
"There's no way I can win by fighting, so I'll join them instead!"
"Revenge can be cold and bloody, or it can be a sweet, tempting trap!"
That's right. Since the road to becoming Demon King was a dead end, she would become a saintess instead.
As long as your thinking is shameless enough, there's always a way around the problem!
She left her useless demon allies behind and threw herself into the goddess's embrace, ready to win by doing nothing.
Holding fast to this belief, Serena set out on her journey once more.
"My enemies, are you ready to face this Love Revenge?"
