Kimito Yamanashi, a 30 year old high school teachers ends up dying due to an unfortunate tragedy. The Goddess of Fate offers him a second chance to live his life in the parallel world of Stellaria. When asked if he desired something, his response was "make me really strong and beautiful". When he woke up in this new world he found out that he has been summoned as a female by the demon clan. The territory which the demons ruled was in the midst of being destroyed because of the hero.

"Please save us from the threat of the Hero!"

So Kimito took on the name of Yurishia and eventually agreed to help the demons, becoming the legendary Warlord. But whilst she was trying to save the world, she almost ends up being killed by the companions whom she wholeheartly believed in. Fallen from her status, the former Warlord now has a burning desire for revenge and living a life dictated by none. Can the Fallen Warlord rise once again to the top of the world?