Yuusha "Hero"
About
17-year-old girl who calls herself "Hero." Since she suffers from amnesia and does not remember her real name, she decides to take the name Yuusha (in Japanese it means Hero). Because of this, she has trouble with the fact that she calls herself a Yuusha. Despite the fact that her character and demeanor are distorted, Yuusha has incredibly excellent skills of martial arts, fencing and sorcery.
At the beginning of the narrative, she appears in the city of Art in order to kill demons in the Underground Labyrinth. Her first step is to join one of the guilds of the city, and she hardly receives a letter of recommendation. By chance, she meets with Matari, and other interesting people and challenges Labyrinth.
In fact, it really is the "Hero" that destroyed the demons that threatened all of humanity 500 years ago. Her former comrades betrayed and sealed it for a long period, as they are very afraid of her, but she was freed and revived at the beginning of the story.