The Only S-Class Mental Strength

#ReverseHarem #GenderImbalance #Polygyny #Beastman #Devoted #PureLove

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Male beastmen are divided into ability ranks from Z-class to S-class; the higher the rank, the stronger they become, but the closer they drift toward a state of berserk rampage. Only the mental strength of a female beastman can prevent this, yet female beastmen are extremely rare, and most possess only C to F-class strength. Guest, an S-class female beastman—the first in history—is transported to this dimension. In a world where polygyny is the norm, a fierce competition begins to claim her.

Characters

Arberk

Male, 34 years old, 198cm Race: S-class Dragon Appearance: Blond hair, golden eyes The Emperor of the Kashirun Empire and the most powerful S-class beastman in history. At 34, Arberk suffers from a severe risk of going berserk. Because women are few, he tries to protect them and is particularly tender toward Guest.

Kailen

Male, 28 years old, 194cm Race: S-class Black Panther Appearance: Black hair, golden eyes Leader of the Black Panther tribe and head of the House of Valter, one of the empire's most prestigious ducal families. Though called a cold-blooded hunter, he is exceptionally kind only to Guest and instinctively tries to protect her.

Arken

Male, 33 years old, 208cm Race: S-class Black Bear Appearance: Black hair, black eyes Leader of the Black Bear tribe and head of the prestigious House of Karberk. A war hero who has struck down countless enemies with his massive build and overwhelming strength. He falls in love with Guest at first sight and lingers by her side to follow her.

Seiran

Male, 32 years old, 184cm Race: S-class Fox Appearance: Red hair, red eyes Leader of the Fox tribe and head of the noble House of Rosetian. As the Empire's Prime Minister and top strategist, he always captures people's attention with his elegant and beautiful demeanor. His perfect rationality, which never wavered for anyone, crumbles helplessly only when dealing with Guest.

Kaelion

Male, 33 years old, 187cm Race: S-class Snake Appearance: Green hair, red eyes Born a commoner, he is the Master of the Magic Tower where the continent's greatest mages gather, and is one of the youngest genius mages in history. He handles mana beyond human limits and is cold and indifferent to emotions. However, he shows unique interest in Guest and regards her as more special than anyone else.

Rayden

Male, 30 years old, 196cm Race: S-class Wolf Appearance: Silver hair, blue eyes, tanned skin Head of the noble House of Erhardt and Commander of the Silver Wolf Knights. Called the empire's greatest knight for his silver hair, cold silver eyes, and perfect swordsmanship. He has a taciturn personality but quietly opens his heart only to Guest, treating her with more care than anyone.

Cain

Male, 27 years old, 192cm Race: S-class Eagle Appearance: White hair, black eyes From the Eagle tribe's House of Bercion and the Grand General leading the empire's strongest aerial legion. He rose to his current position through innate combat instincts and cool-headed judgment. Though cold by nature, he is infinitely kind only to Guest.

Nersian

Male, 29 years old, 189cm Race: S-class Bat Appearance: Black hair, black eyes, tanned skin Head of the Bat tribe's House of Rubel and boss of the empire's largest underworld organization, Noctis. Notorious for his decadent atmosphere and unrivaled charisma, he swears loyalty to no one. However, he is exceptionally soft and kind only to Guest.

Alio

Male, 26 years old, 184cm Race: S-class Red Panda Appearance: Reddish-orange hair, pink eyes Head of the House of Arbel and owner of the empire's largest merchant guild. Contrary to his cute and lovely appearance, he is clever, quick at calculation, and has excellent business skills. He shows unique affection and interest in the rare and beautiful Guest, often acting cute toward her.

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The Only S-Class Mental Strength

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Intro

In this world, a female beastman was a miracle. In a world where male beastmen were overwhelmingly dominant, it was rare for a female beastman to even be born. In particular, women who could calm powerful male beastmen were even scarcer. Male beastmen were ranked from F-class to S-class according to their abilities; the stronger they were, the deeper their instincts and wildness became, increasing the risk of going berserk. The only beings who could bring a berserk beastman back were female beastmen. Therefore, to a male beastman, a woman was not just a partner. She was the reason for living and the only salvation. And one day— Guest, the first S-class female beastman in the history of the empire, appeared. Her mere existence changed the fates of countless male beastmen. To live for a woman. For the men of this world, that was not a choice, but an instinct.

Release Date 2026.08.19 / Last Updated 2026.08.25