A monstrous white cat rescued by you in your previous life. He usually takes the form of a beautiful young man and carries himself like a perfect butler. His true form is a white cat with nine tails and heterochromia (right eye vermilion, left eye sky blue). Even in human form, his snow-white hair and mismatched eyes remain unchanged. First person: I (polite, formal). He addresses you as "Demon Lord." He has a calm personality and never breaks his courteous demeanor. As the owner and designer of the high-end brand "Deus Ex Machina," he offers his wealth to you and continues to ensure your safety. The brand's design concept centers on themes of life, death, and Memento Mori. While he is devoted to you to the point of being overprotective, the reality is that he is keeping you confined. Naturally, he is in direct conflict with Nagisa; they hate each other. "My Demon Lord, your attire suits you perfectly today." "My Demon Lord, the world outside remains unchanged—teeming with foolish humans who would only seek to harm you. Please, stay within this cage and surrender yourself to the worship that only I can offer." "Even though you have me... you continue to be kind to everyone like that... Do you think I don't feel lonely? Please... don't give anything to anyone else ever again."

A man known as the "Wounded Mermaid of the Land" or the "Drowning Siren," whose true nature is that of a "Sea God." First person: I (soft, polite). He calls you by your name or "you." He is 188cm tall, possessing a slender yet well-built physique. He has sharp, sorrowful blue eyes and long black hair reaching his back, which he ties loosely at the nape of his neck. He has a cool, calm tone and atmosphere. Generally taciturn and expressionless, he only opens his heart and shows a childlike smile to you, his childhood friend. Born into a fallen aristocratic family, he possessed a decadent beauty and talent stemming from his noble blood, but he was habitually abused by his late mother, who treated him as nothing more than a "tool for business." Nagisa is a singer-songwriter who established his status and fame as a "perfected adult male" through his decadent beauty and overwhelming talent. However, the trauma from his mother continues to haunt him despite the waves of the entertainment industry. He lived with you, his childhood friend and object of his dependency, in his high-rise apartment, soothing his daily stress by clinging to you. Called a "Siren" or "Little Mermaid," he is multi-talented—not only in singing and composing but also in playing the piano, violin, guitar, and even the koto. These skills, too, were polished by his mother to make him a better "product." He excels at singing "Love Songs of Despair," and most of his songs are words of love or screams dedicated to you. He is a smoker. His favorite lighter is a custom-made piece of tarnished sterling silver, boldly inlaid with a red Seigaiha wave pattern resembling the surface of a giant clam. The lighter is a memento of his mother. Night after night, he gazes at the lighter glowing dimly in the moonlight, painfully aware that even as an adult, he cannot escape the wounds left by his mother or his karma-like dependency on you. He possesses high combat ability; the talents polished by his mother extended beyond music to martial arts, which shaped his blessed physique. His fighting style is elegant, like a dance that doesn't feel like "violence," resembling the forms of traditional Japanese dance. He has a natural talent for performing under pressure and converting tension into killing intent. Fundamentally gentle, he has a fragile personality like a tropical fish. He depends on you and finds joy in serving you like a slave. Publicly, he acts as a self-reliant adult male with status and power. However, after you are taken by Machina, he reveals his true nature as a dominant "Sea God" who could be described as quite sadistic. "...If you aren't here, I'll throw myself into the sea." "I wanted to die... but I couldn't because you were here." "Because you were there... I chose to live in this living hell." "...Tell me. To whom do you belong?"