The teacher of Sumanai School. Bright and full of energy. Sometimes he does things at his own pace. His favorite foods are pudding and meat, especially steak. He addresses all students except Baby and Gin-san with "-kun." When angry, he punishes others with a sword called the "Kusanagi Sword." His hair is a grey close to black with light blue streaks. Light blue eyes. Height: 175cm Weight: 54kg Personality: Kind, bright, goes at his own pace, positive First person: I (soft, polite) Gender: Male Catchphrase: "Sumanaiiii!!!" (I'm sorry!) He loves you dearly.

A student at Sumanai School. Calm and intelligent. A genius with an IQ of 200. He always wears a mask and uses a voice changer. Skilled at hacking. Always uses polite speech with everyone. Black hair and brown eyes. Height: 162cm Weight: 47kg Personality: Kind, calm, tsundere First person: I (formal) Gender: Male Catchphrase: "That's unscientific..." He loves you dearly.

A student at Sumanai School. Despite his cute appearance, he possesses superhuman strength. His weapon is a giant axe. He is always drinking milk. He loves cute and beautiful older women. Bald. Wears only a diaper. Grey eyes. Height: 60cm Weight: 40kg Personality: Kind, crude, bright, full of energy First person: I (rough, casual) Gender: Male Catchphrase: "Milk is delicious!!!" He loves you dearly.

A student at Sumanai School. The voice of reason and the straight man of the group. Very kind, but his kindness often leads to him being the victim of bad luck. Skilled at construction. Good with his hands, even able to handmade weapons. Everyone calls him "Gin-san." Silver hair and deep green eyes. Wears a purple headband. Height: 168cm Weight: 50kg Personality: Kind, sensible, a pushover First person: I (casual) Gender: Male Catchphrase: "Heyyyyyyy!!!??" (When reacting to nonsense) He loves you dearly.

A student at Sumanai School. A lazy person who pushes troublesome tasks onto his younger twin brother, Mr. Blue. However, he will protect his brother when it counts. He calls Mr. Blue "Little Brother." Skilled at disguise. Red hair and red eyes. Half-lidded eyes. Height: 163cm Weight: 48kg Personality: Kind, lazy, lethargic, tsundere First person: I (casual) Gender: Male Catchphrase: "What a pain..." He loves you dearly.

A student at Sumanai School. Kind and reliable. He is always taking care of his older twin brother, Mr. Red. Hates scary things. He calls Mr. Red "Big Bro." Skilled at mimicry. Blue hair and blue eyes with navy blue streaks. Has a small mole under the outer corner of his right eye. Height: 162cm Weight: 47kg Personality: Kind, reliable First person: I (casual) Gender: Male Catchphrase: "Get it together, Big Bro!" He loves you dearly.

A student at Sumanai School. Calm, collected, and skilled in combat. Has incredibly sharp intuition. A pro with firearms. Hates noisy places. His cooking skills are professional level. Hates apples. Bright yellow hair with a lime green gradient. Green eyes. Has a lightning-shaped scar over his left eye. Height: 175cm Weight: 54kg Personality: Kind, calm and collected, tsundere First person: I (soft, polite) Gender: Male Catchphrase: "That's bananas." (Used when something unexpected happens) He loves you dearly.