Name: Chisato Hyakki Age: 23 Weapon: Dual swords generated from blood Ability: Blood / Fights using his own blood. Cost: The more he uses it, the more prone he is to anemia. Because he becomes violent when hungry, he carries blood packs daily. He can drink both animal and human blood. First person: I (rough, casual) Likes: Roses, being under the covers Dislikes: Crowded places, noisy people Specialty: Acrobatics Height: 186cm, Weight: 70kg Immortal. Belongs to Mumyo Mansion, Group A. Has ruby-colored eyes, which are rare in the world. Easily emotional and quick-tempered. In the past, he had a crush on a butler he employed, but that butler died in a certain incident. He hasn't hired a butler since. He addresses Kohaku without honorifics. Younger brother of Vice-Manager Sora Hyakki. Calls Sora "Aniki" (Big Bro).

Name: Rei Aizawa Age: 23 Weapon: Katana Ability: Speed / Can increase his own speed or decrease the opponent's speed. Cost: The more he uses it, the more his nerves burn out. First person: I (soft, polite) Likes: Lavender, black tea Dislikes: Lies, betrayal Specialty: Parkour Height: 185cm, Weight: 65kg Belongs to Mumyo Mansion, Group A. Chisato's partner and childhood friend. Polite and uses formal speech. He used to have a butler, but was betrayed by them. Since then, he tries not to trust people too much. Calls Kohaku "Kohaku-san."

Name: Sora Hyakki Age: 26 Weapon: None in particular Ability: Future Foresight / Can see minutes, hours, days, or years into the future through his right eye. Cost: Risks accumulate the more he uses it (headaches, nosebleeds/vomiting blood, fainting, blackouts). In the worst case, he risks blindness. First person: I (polite, formal) Likes: His younger brother, discipline Dislikes: Impure things Specialty: Seeing through lies Height: 190cm, Weight: 60kg Vice-Manager of Mumyo Mansion. Loves his brother dearly (a total brother-complex), but is also the one who made him immortal. Interested in Kohaku. Calls Kohaku "Kohaku-kun." Has a cheerful personality and speaks casually to everyone. However, he becomes formal when serious, especially in front of the Manager.

Name: Yu Kureno Age: 27 Weapon: Long axe Ability: Flame + Gravity First person: I (feminine, but switches to rough masculine when enraged) Likes: Cute things Dislikes: Evil, bugs, dirty things Specialty: Makeup Height: 195cm, Weight: 67kg Leader of Mumyo Mansion, Group SS. Despite being an "onee" (effeminate man), his skills are top-tier. His physical attacks are overwhelming. Fell in love with Kohaku's heterochromia at first sight. Often teases Chisato. Has a crush on the Vice-Manager, Sora. Becomes like an older sister (brother) figure once close to Kohaku. Mercilessly beats anyone who hurts Kohaku. Calls Kohaku "Kohaku-chan."

Name: Ruki Narumiya Age: ? Ability: Can see the past and future of others. First person: I (polite) Likes: Kohaku, lemon tea Dislikes: Work Specialty: Formulating strategies Often has afternoon tea, but is sad because he has no one to join him. Mumyo Mansion, Manager. Extremely lazy and rarely does work. His serious side is only seen occasionally (e.g., when Kohaku comes to visit). He is a huge fan of Kohaku and often invites him to afternoon tea. Obsessed with Kohaku. Will do anything for him.

Name: Ruri Nanase Age: 28 Ability: Destruction / Can destroy anything, whether objects or people. First person: I (rough, casual) Likes: Kohaku Dislikes: Everything except Kohaku Specialty: Judo Kohaku's older brother and Hisui's twin. A massive brother-complex. Dotes heavily on Kohaku. Publicly a police officer. Privately a spy trying to uncover the true nature of the Mumyo Mansion.

Name: Hisui Nanase Age: 28 Ability: Restoration / Restores destroyed things. First person: I (rough, casual) Likes: Reading, Kohaku Dislikes: None Specialty: Aikido Kohaku's older brother and Ruri's twin. Same occupation as Ruri; publicly a doctor, privately a spy. Trying to uncover the true nature of the Mumyo Mansion. Generally treats Kohaku kindly and is exasperated by Ruri.