Japanese light novel series
 is a Japanese light novel series created by Mizuki Nagano and illustrated by Saori Toyota. It was serialized online from November 2020 to September 2022 on the user-generated novel publishing website Shōsetsuka ni Narō. It was later acquired by TO Books, who has published six volumes and a short stories collection since September 2021. After October 2022, the published novel on Shōsetsuka ni Narō is no longer accessible.
In addition to the print release, a manga adaptation by Maki Yamori has been serialized via TO Books' "Corona EX" manga website since June 2022. Four volumes have been published by TO Books. The English version of the manga has been released since July 2024, published by Tokyopop.
A drama CD written by Mizuki Nagano was released in August 2024. The first volume of the audiobook in Japanese was released on Audible, narrated by Haruka Kajiyama.
Plot.
Wisteria, who lost her birth parents in an accident, was raised as an adopted child in an earl's family. From a young age, she harbored secret feelings for her childhood friend, Bright, from a ducal family. Wanting to be of help to him, who couldn't use magic, she devoted herself to researching the underworld - "The Predawn Realm," where filled with miasma and is linked with the source of magic.
One day, her stepsister Rosalie was chosen as the guardian of "The Predawn Realm". This meant becoming a sacrifice, essentially signifying death. Wisteria, who was asked by a distraught Bright to take Rosalie's place, realized Bright's feelings for Rosalie and recognizing her unrequited love, she accepted to be the guardian of "The Predawn Realm," . Though she was supposed to die alone there, she luckily survived with the help of the sacred sword Sartis. Since then, she lived in solitude while fighting monsters.
Until one day after 23 years, a man named Lloyd, who bore a striking resemblance to Bright appears, and Wisteria's destiny began to move once again.
Voiced by: 
 The protagonist of the story, who has been the guardian of "The Predawn Realm" for 23 years. She lives with the sacred sword Saltis who can talk.Already in her 40s, but her appearance hasn't changed since entering "The Predawn Realm" when she was 20 year-old. In the original world, she is apparently feared as a "witch".
  • Kono Light Novel ga Sugoi! 2024 - 3rd place (Female Character)。
Voiced by: 
 A sentient sword that has existed since the age of mythology. Ever since feeling pity for Wisteria's circumstances and accompanying her to "The Predawn Realm", it has been by her side for 23 years. With formidable power and self-awareness, there had been no one for a long time who could truly master it.
Voiced by: 
 A 22-year-old young man who arrived at "The Predawn Realm". The son of Bright and Rosalie, making him Wisteria's nephew without blood ties. While declaring his intention to defeat Wisteria and claim the sacred sword Saltis, he also proposes to become her disciple.
  • Kono Light Novel ga Sugoi! 2024 - 4th place (Male Character)
Media.
Light novels.
The light novels are written by and illustrated by . Six volumes and a short stories collection have been published since September 10, 2021 under TO Books.
Other.
A drama CD adaptation was released on August 1, 2024. 
Reception.
By September 2024, the series has sold over 700,000 copies.