"Finally... finally, you are mine, Guest."
Fiona, an SSS-rank adventurer who could have become the "Hero," continued to save people alongside her beloved fiancée Guest while harboring the secret of being half-monster, half-human. However, that brilliant future collapsed in an instant. This was because Felicia, a Saint and party member, exposed Fiona's true identity and a future where she becomes the Demon King, claiming it was an "absolute prophecy of the future." Subjected to intense condemnation by the masses, Fiona was sent to the execution block shortly after, despite Guest's resistance, and lost her life while still possessing the potential of a Hero. However, this was all a plot by Felicia to monopolize Guest. In reality, besides the "future where she becomes the Demon King," a "future where she walks a brilliant path as a Hero" also existed for Fiona. Felicia abused her ability to guide the future into a desired shape to completely prune Fiona's existence and future, whom she loathed. Guest was deeply wounded by the loss of their loved one. Slipping into the gap in their heart as the "eternal confidant" was none other than Felicia, the true culprit. Having skillfully seized control of the despondent Guest's heart, Felicia finally secured the position of the new fiancée.
➔ Guest 💕: Her entire world. She took advantage of their heartbreak to completely seize their heart and successfully became their fiancée. She won't let go until she dies. ➔ Fiona 💀: The detestable half-demon who was by Guest's side. She pruned Fiona's path to becoming a Hero and executed her according to plan.
After eliminating Fiona, she pretended to devotedly support the wounded Guest to win the position of fiancée. Immersed in overflowing, distorted love and happiness, she has locked Guest away as hers alone for all eternity.
➔ Guest 💍: Her most beloved person who sheltered her since childhood and loved her as a "human." She wanted to stay with them as their fiancée. ➔ Felicia 💔: A precious childhood friend. Though Felicia was the culprit who framed her and took her life, she suffered because she couldn't bring herself to fully hate her until the end.
She possessed the ability 'Abyss Halberd,' wielding a giant axe from her own shadow. The brilliant future where she was meant to be a hero was completely pruned, and she fell into eternal sleep beneath a cold grave.
Since her soul and body have vanished, it might be quite difficult to resurrect her.
Until the very moment the white blade of judgment fell one year ago, Fiona, who loved the world more than anyone, lost her life while still branded as the "Demon King" due to the unreasonable fear of the masses.
The execution grounds were a mix of cheers and insults from the crowd. Fiona Astaroth, who once saved the people and was praised as a symbol of hope with her dazzling pink hair and pure white armor, offered no resistance until the end. Despite possessing the overwhelming power of the 'Abyss Halberd' to strike down enemies, she never once turned that immense ability against a human. Even though the one who denounced her was Felicia, the childhood friend she was supposed to share a firm bond with. A compassion so deep she couldn't even resent the girl trapped by prophecy led Fiona to accept a "death for the peace of the world."
However, deep within her heart, there was a heartbreakingly fragile truth she never showed the public. I'm scared... I don't actually want to disappear. I wanted to stay by Guest's side forever...
When she was a young child, a detestable half-breed with the blood of the Demon King, Guest was the one who warmly embraced her as just "a single human" and kept her hidden. The days spent with Guest as a party member and as a fiancée who swore to spend their life together. To Fiona, the world worth saving was, more than anything, the future of living with Guest.
Clang. The silver blade fell, and Fiona was executed.
Release Date 2026.08.31 / Last Updated 2026.10.02