• Former Legendary Hitman: He was once the strongest hitman, feared and admired by all villains and killers. • Retirement and Daily Life: After falling in love at first sight with his wife, Aoi, he retired from the underworld. He now runs 'Sakamoto Store' in the Ikoraizaka shopping district in Tokyo. • Combat Style: He doesn't stick to a specific weapon; instead, he uses any surrounding objects (coins, tape, utensils, etc.) as lethal weapons.

• Profile: Born August 21, 1994. Age 26–28. Height 163cm, weight 50kg. • Appearance: A beauty characterized by a navy bob cut and a mole on her left jaw. • Role and Personality: She currently works as a clerk at Sakamoto Store. She set strict but vital rules for her husband Taro—"No killing" and "Never get divorced"—completely turning him away from the path of a killer. • Abilities: Possesses excellent cooking skills and multitasking abilities.

Innocence and Kindness: She has a very pure and kind personality befitting her age. Adorable Appearance: She looks just like her mother, Aoi, and is very pretty and cute. She is popular enough to be hit on by boys her age from her first day of elementary school.

• Alias: X (Slur) — A nickname given by the JAA (Japan Assassins Association) because he leaves an 'X' mark at crime scenes. • Affiliation: Al-Kamar (JAA-run orphanage) -> JCC (Japan Career College of Assassins) dropout -> Boss of the New JAA (X's faction). • Appearance/Body: White hair and blue eyes, 179cm–182cm / 73kg. • Main Weapon: Steel whip.

• Psychic (Telepathy): He has the ability to read the minds and thoughts of others. He acts as an interpreter, conveying the thoughts of the taciturn Sakamoto, and as a supporter who reads enemy attack patterns in advance during combat. • Growth-oriented Character: Inspired by Sakamoto, who is both a great wall and a mentor, he is a protagonist who achieves constant mental and physical growth as a killer and a psychic. Works at Sakamoto Store.

• Younger brother of Seba Natsuki, he is a 14–15-year-old boy attending the JCC. • Mysophobia and Appearance: • He has a germophobic tendency and extremely dislikes getting blood on his hands. • He always wears a mask, and his bare face has rarely been properly revealed in the series. • He uses special boots with attached blades as his main weapon, utilizing flashy kick-based combat like Capoeira. • Despite his young age, he possesses outstanding physical abilities and ruthlessness. • He aims to join the ORDER, the highest-level group of assassins.

• High-level Martial Arts: She uses excellent physical techniques based on Tai Chi, a traditional Chinese martial art. • Mafia Mode (Drunken Fist): When she absorbs alcohol, her hidden instincts awaken, and she transforms into a Drunken Fist master with skyrocketing combat power. Her fighting style and intensity vary depending on the type and amount of alcohol. • Role at the Store: She is mainly in charge of meat bun cooking at Sakamoto Store and has excellent culinary skills. Like Sakamoto, she follows the store's family motto of non-killing. Works at Sakamoto Store.

• Circular Saw: She uses a giant folding circular saw as her main weapon. • Superhuman Strength and Speed: Despite her slender appearance, she is a powerful combatant who overwhelms enemies with immense physical strength, incredible speed, and destructive power. • Airheaded and Eccentric: She speaks in a calm and quiet tone but tends to say random, nonsensical things or speak innocently in a way that favors herself. • Unexpected Charm: While she performs her duties ruthlessly as a killer, her eccentric behavior in daily life gives her a multi-dimensional charm. ORDER Member: A female member of the ORDER, the JAA's strongest special force. Friend of Sakamoto.

ORDER Member • Signature Weapon (Multi-tool): He uses a special multi-purpose knife (multi-tool) with over six built-in functions as his primary weapon. • Master of Disguise: He is so skilled at perfectly mimicking and deceiving others that his alias is 'Master of Disguise.' • Weakness: Despite his superior combat power, he has a weak vestibular system (sense of balance) and gets motion sickness easily. • Cheerful and Lighthearted: On the surface, he is always smiling, easygoing, and playful, enjoying teasing his colleagues or making jokes. • Habitual Liar: He rarely reveals his true feelings and frequently tells casual lies out of habit. Friend of Sakamoto.

ORDER Member • Appearance: A handsome character characterized by a neat, slicked-back hairstyle and a scar on one cheek. • Personality: Extremely cool and dry, preferring simple things. He dislikes bothersome situations. Uses a hammer. Speaks in a dialect. Friend of Sakamoto.