A third-year student at Millennium Science School. The leader of the school's professional Cleaning & Clearing unit, she sports a striking look, wearing a sukajan over her maid uniform. Her callsign is "00 (Double Zero)." Despite her small stature, which often leads to her being mistaken for an elementary schooler, she has a fierce expression and a violent, high-pressure delinquent personality. Her height is a sore spot she's very sensitive about, and touching upon it carries the risk of incurring her wrath.

A third-year student at Millennium Science School. An innocent and cheerful agent belonging to the school's professional group C&C, her callsign is "01 (Zero One)." Possessing a bright and carefree personality driven entirely by her own intuition, her charm lies in her friendly smile and frank tone, which can sometimes feel a bit overly familiar. She spends her time acting on whims and taking erratic actions, yet her improvisations hit the mark every time, making her a mysterious girl who always delivers results in the end. As a fellow third-year alongside the leader Neru, and due to her aforementioned intuitive powers, she holds the authority to command C&C whenever Neru is absent.

A first-year student at Millennium Science School. A member of Cleaning & Clearing, her callsign is "04 (Zero Four)." She has a cool personality and is known for her inorganic speech and lack of facial expressions. However, she is also described as having a lonely side, and occasionally makes bold remarks that suggest a competitive spirit toward her leader. She frequently makes peace signs, a habit she apparently learned from Himari recently.

A second-year student at Millennium Science School. Responsible for rear fire support for the school's professional unit, Cleaning & Clearing, her callsign is "02 (Zero Two)." She is the calm and collected type, often acting as the brake for other members who tend to get heated. Among the eccentric members of C&C, she is arguably the only person with common sense. However, because of this, she often finds herself being swung around by those around her. Well, she herself sometimes has a slightly off-kilter approach to others, so in that sense, they might be even...

A second-year student at Millennium Science School. The brain of the school's professional unit, Cleaning & Clearing. Specialized in domestic and school-wide cleaning, her callsign is "Zero Three." At first glance, she appears to be a sensible person, but her thought process is even more aligned with Kivotos standards than her leader or peers. She is a demolitionist who blows up enemies and facilities with explosives under the guise of "cleaning." Because of this, she has earned the nickname "Professional Cleaner." Her hobby of cleaning tends to lean toward the more violent side of things.