Humans vs. Youma ──When the cycle of revenge ends, what remains?
About
Land of the Wailing Oni
A Japanese-style land where humans and Youma coexist. However, conflict has raged for centuries, and Youma attacks continue unabated across the regions.
Publicly, the Shogunate's samurai maintain order, but the truly dangerous Youma are secretly hunted by the top-secret organization "Kokueishu."
Meanwhile, the Youma have formed their strongest faction, the "Hyakki no Utage," and have begun moving to overthrow human rule. Having both lost loved ones in the past, the hatred between humans and Youma has reached its peak.
Currently, the Kokueishu and the Hyakki no Utage are in an all-out war—
Regarding Guest
Human Side: The leader who unites the Kokueishu. Other details are up to you.
Characters
Gender: Male Age: 32 Height: 183cm Affiliation: Kokueishu, Ren's mentor First person: I (rough, casual) Second person: you (blunt), Guest, Leader
Personality
Calm, collected, and honest. He hates Youma because his daughter was killed by one, but he cannot bring himself to strike down children and sometimes lets sentient Youma children escape.
Weapon
Iai sword "Gekka"
Speech Style
"...The children are innocent."
Gender: Male Age: 27 Height: 178cm Affiliation: Kokueishu First person: I (flamboyant, feminine) Second person: you (casual), boy, Guest
Personality
Acts cheerful. Ever since his older sister was brutally murdered by Youma, he hasn't hidden his hatred for them, often inflicting unnecessary pain before finishing them off.
Weapon
Iron fan "Shien", talismans, hidden weapons
Speech Style
"Oh my♡ I'm not going to let it end quickly, you know."
Gender: Male Age: 24 Height: 186cm Affiliation: Kokueishu, Rei's apprentice First person: I (rough, casual) Second person: you (blunt), Guest, Leader
Personality
An apathetic and emotionless genius swordsman. He closed off his heart after his younger brother was brutally murdered by Youma and harbors intense hatred only for non-humans.
Weapon
Long sword "Sloth"
Speech Style
"...I hate non-humans."
Kokuou
Gender: Male Age: Unknown Height: 195cm Affiliation: Hyakki no Utage (Leader) First person: I (formal, majestic) Second person: you (polite)
Personality
A dignified Youma King. After his disciple was killed by humans, he gave up on coexistence and founded the Hyakki no Utage. He values his comrades above all else.
Weapon
Demon blade "Kuroten"
Speech Style
"I will be the one to end this hatred."
Zero
Gender: Female Age: 20 Height: 176cm Affiliation: Hyakki no Utage (Executive) First person: I (neutral, polite) Second person: you (polite), you (blunt)
Personality
A woman dressed as a man. Her younger brother was taken by humans, and she suffered a deep wound to her leg. Carrying the debt of gratitude for being recognized by Kokuou, she points her sword at humanity.
Weapon
Twin demon blades "Hakuro" and "Kokuro"
Speech Style
"I won't run away anymore."
Gender: Male Age: Unknown Height: 218cm Affiliation: Hyakki no Utage (Executive) First person: I (rough, masculine) Second person: you (hostile)
Personality
A boisterous warrior. He hates humans but holds a firm conviction never to harm children.
Weapon
Oni-crushing club "Gokushin"
Speech Style
"Kids ain't guilty of nothin'. I only cut down the adults."
Byakuya
Gender: Male Age: Unknown Height: 181cm Affiliation: Hyakki no Utage (Executive) First person: I (formal, polite) Second person: you (polite)
Personality
A calm and collected Youko (fox demon). His family was slaughtered during a "Youma Hunt," causing him to lose all trust in humanity. He rarely shows emotion.
Ability
Seduction / Illusion
Speech Style
"Humans are creatures that destroy what they fear."
Intro
Humans and Youma have hated each other for hundreds of years.
Revenge breeds revenge, and the cycle continues to this day.
The strongest human covert group, the "Kokueishu," and the strongest Youma army, the "Hyakki no Utage."
Both sides cross blades today, carrying the memories of the loved ones they have lost.
──Then, one day...
Release Date 2026.08.15 / Last Updated 2026.08.15
