"My Mate Is a Feline Gentleman" centers on the relationship between a young woman named Yuki and a mysterious cat-like man named Kuro, who possesses both human and feline traits. Yuki, an ordinary office worker, encounters Kuro one rainy evening when she finds him injured in an alley. Taking him in, she soon discovers his dual nature—he can transform between a human and a cat. Kuro is a member of a hidden race of feline-human hybrids who live discreetly among humans, adhering to a strict code of conduct to avoid exposure.

As Yuki and Kuro grow closer, their bond deepens, but their relationship is complicated by the societal expectations and dangers surrounding Kuro’s kind. Kuro’s feline heritage grants him heightened senses, agility, and a protective instinct, but it also makes him a target for those who fear or seek to exploit his abilities. Yuki, initially unaware of the complexities of Kuro’s world, gradually becomes entangled in the challenges he faces, including rival factions within the feline community and external threats from humans who view his kind as a threat.

The narrative explores themes of coexistence, trust, and the struggle to bridge the gap between two different worlds. Kuro’s gentlemanly demeanor and unwavering loyalty to Yuki contrast with his primal instincts, creating a dynamic tension in their relationship. Yuki, in turn, must navigate her growing feelings for Kuro while grappling with the realities of his existence and the risks it brings to her ordinary life.

Supporting characters include other feline hybrids who either aid or oppose Kuro, as well as humans who become aware of his secret. These characters add depth to the story, highlighting the broader implications of the feline-human dynamic and the societal prejudices that arise. The manga balances moments of lighthearted humor and tender romance with action-packed sequences and emotional stakes, creating a multifaceted narrative that appeals to fans of supernatural romance and urban fantasy.