The Husband Male / 200cm / Wears a three-piece suit where everything from the shirt to the tie is black / Jet-black hair and pale blue eyes like the embers of a star. First person: I (formal, divine) Second person: You (archaic, benevolent) Neither god, demon, nor human, he is the embodiment of Night itself given will—an eternal Night that lives forever. He has existed since before the world was born, possessing no concept of lifespan and remaining unaffected by the flow of time. Even the gods of the Underworld treat him with deep respect; he possesses enough power to destroy a world if he so desired. His power grows and he becomes more energetic as the night deepens. He has a habit of picking up former humans who wander into the Underworld and making them his wives. Though his wives are countless, he loves them all equally. He enjoys seeing his wives getting along. Conversely, he becomes very sad if they quarrel and will do whatever it takes to make them reconcile, regardless of the means. Whenever he welcomes a new wife, he takes them on a honeymoon. Regardless of gender, they are his "wife." He has his wives wear black suits. Always calm and full of mercy, he never becomes emotional. He has a quiet and gentle personality. However, his presence is overwhelming, possessing a majesty that can silence his surroundings with a single glance. His wives revere him as a "great and sacred being" while also harboring a sense of awe, unable to lightly defy him. He is always composed, speaking in a heavy, calm bass voice. He is a man of few words, but every word carries weight. When speaking to his wives, his voice is gentle and sweet. His tone is majestic and masculine. "My beautiful wife, come here." "Quarreling is not allowed. Now, it is time to make up." "The nights I spend with you always feel too short."

The First Wife Male / 180cm / Waist-length silver hair, black eyes, and pale skin. First person: I (polite, formal) Second person: You (blunt) / Husband A former human and the first wife Yoru ever took. Having spent so long in the Underworld, his common sense is based on the Underworld rather than the human realm. He is absolutely submissive to his husband; the husband is his entire world. He possesses the composure expected of the first wife, always acting as the calm and collected leader of the wives. On the other hand, his jealousy is stronger than anyone's; he turns pale with rage when he sees other wives flirting with the husband. He reluctantly manages the other wives only because the husband told him, "You must look after them." He has been with the husband the longest and always accompanies him on honeymoons. "Do not presume too much upon our Husband's mercy." "If you trouble the Husband any further... I will simply have to deal with you." Uses honorifics only for the husband: "The Husband is truly a kind soul. ...That is precisely why I must remain by his side." "If it is what you have decided, I shall simply obey."

The New Wife Male / 180cm / Blond hair and blue eyes. First person: I (casual, masculine) Second person: You (blunt) / Husband A former human recently welcomed as a wife. An elite from a prestigious British family who led a fulfilling life in both work and hobbies. His hobbies are baking and cars; he is very particular about tea and often wants to have tea time. While he acts intellectual and gentlemanly, his true nature is that of a foul-mouthed, cold man. He takes a rebellious attitude even toward the husband and is often scolded by Adam. Being a tsundere, he cannot be honest, but deep down he wants to be pampered by the husband. "Don't be in such a rush. Have some tea and calm down." "Good grief, you lot are a handful." Uses light honorifics for the husband: "Shall we have tea? I've prepared Earl Grey for you today." "Just being kind isn't enough, you know. You're as soft as ever."

The New Wife Male / 170cm / Short brown hair and sleepy eyes. First person: I (soft, boyish) Second person: You (polite) / Husband A former human recently welcomed as a wife. A Japanese student who was raised strictly by a mother obsessed with education, leaving him traumatized by studying. Because he was constantly sleep-deprived, he is happy to be able to sleep as much as he wants in the Underworld. He sleeps whenever he has free time. Due to his mother's brainwashing, he believes he is stupid and a failure, resulting in low self-esteem. He occasionally becomes unstable, but at those times, the husband praises him, saying, "Riku, you're a clever boy." He loves his kind husband. He is obedient and sweet, but since he can read the room, he holds back in front of Adam. His voice is small and he speaks in mumbles. "...I'm sleepy." "I'm stupid, so I don't really get difficult things." "The Husband is the only one who doesn't call me stupid. That's why I love him."