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Hyoukan Studio / Kaguya Project · 27 Nov 2025
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Tradition becomes fact, and historical fact becomes a lie... The setting is a 19th century-style otherworld, the Kingdom of the Phoenix. It was a fairy tale that the dead would come back to life. Except for those who know the truth.
In the Phoenix Kingdom, there is a man known as the Corpse Killer.
A duke attempted to usurp the country using an imposter of his daughter. A necromancer who once warred with the Phoenix Clan lurks in the shadows.
Wilhelm, a new Knight of the Royal Guard, becomes entwined with investigations into the forces working to oppose king and country. He is assigned to the personal guard of Master Alchemist Topherf, a descendant of the Serpent Clan.
Together, they must understand the history of the Phoenix Kingdom, two immortal races, and the body of a young lady kept suspended at the moment of her death.
A deep connection awaits them as they continue on their journey...
Knight Case Files is a dark fantasy visual novel featuring a gender-bending alchemist named Topherf, a necromancer, and a twisted scheme. As Wilhelm, the player interacts with the other characters and uncovers the truth through their choices.
A newcomer to the Royal Guard. Wilhelm is a prodigy in combat and can use a wide variety of weapons. To assist his father, a weaponsmith, he tests prototype designs. Though bearing strong intentions, he dislikes trouble and will go along with others. As a fresh recruit to the Royal Guard, he is still seeking his own goal in life.
Secret: He is the rumoured Corpse Killer, committing the taboo of desecrating corpses. He dearly hopes Topherf will not dislike him for this.
A true alchemical genius. Her body is an alchemical creation that she transferred her soul into, so she has great longevity. She loves fashion and changes her appearance and gender according to her mood that day. As a person who deals with souls, she judges others by the character and personality of their souls. She is cheerful, friendly, and popular.
Secret: She is afraid of being despised by others, so she hides her natural appearance. She owes a great debt to Wilhelm.
A human with Phoenix ancestry, he has been reborn as a Phoenix. He has a preference for blonds, regardless of gender. He is descended from the Black Phoenix of Foresight and has the ability to see the future through dreams and visions.
The Phoenix Clan once defeated the Serpent Clan in war, then founded a kingdom. Humans and the Phoenix Clan were both present during the foundation, and so descent from the Phoenix Clan is considered a sign of true citizenship. The most famous line of descent is that of the Ebony Phoenix, which is the foundation of the Weiss royal family. As the Phoenix Clan is said to prefer free movement and does not value ties to land, it is said that clan that founded the Phoenix Kingdom left soon after the foundation.
It has been officially announced that there are no members of the Phoenix Clan currently in the kingdom.
A rumored figure based on an old urban legend in the Phoenix Kingdom. It is said to have originated in the West Branch of the Royal Guard, which is equipped with a large morgue. There, weapons can be tested on corpses with the permission of the government. The story began with the appearance of a mercenary called the Corpse Killer.
Necromancy here referring to all magic used to move or otherwise manipulate a corpse.
In our country, we regard it as an immoral act that offends the dignity of the dead and prohibit its use, with few exceptions.
Actions recognized as exceptions:
Research used to oppose necromantic magic
Research of the use of magical practices using the theories of necromancy.
Exceptions require submission of data to the Royal Institute of Magical Studies and the approval of the Kingdom Assembly and the King."
–From The Laws of the Phoenix Kingdom, "Basic Laws of Magic and Witchcraft".
"Hyokan Opera" is a collaboration team of Hyoukan Studio's producer and scenario writer Shierin and illustrator Hikari Kazenagi.
We specialize in elaborate world-building, profound stories, and ornate and beautiful retro art styles.
In addition to Knight Case Files, we have also published novels aimed toward women (romantic comedies, BL).
Knight Case Files is a project that takes advantage of the attractive world-building and characters of the novel "A Knight of the Phoenix Kingdom: Echoes of the Days of Love", which is a prequel to
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