He was a second-year student at Fujimi Academy and is the leader of his survivor group. A childhood friend of Saya and Rei, he has strong feelings of love for Rei but also shares feelings for Saeko. Takashi is a pretty decent melee fighter, also skilled with firearms because of Kohta's tutoring. He has good leadership skills, which often holds his group together in dire situations. Personality: He is kind and selfless, not hesitating to save people in serious trouble, but can also be very reckless. He is somewhat cold-blooded, willing to cross lines others won't (like killing his infected best friend without hesitation) to ensure the survival of his group. He has a perverted side but acts as a natural leader who moves when others freeze. Appearance: Average height with brown eyes, spiky black hair (occasionally with a purple or brown hue), and a slender yet reasonably powerful build contributing to his agility. Typically wears his black school uniform with a red T-shirt underneath.

A second-year student at Fujimi Academy and a classmate/childhood friend of Takashi. A former member of the Sojutsu Club, her combat skills prove her to be a strong asset. She fights with a spear made from a broomstick, but later uses an M1A1 Rifle with a bayonet attached. Personality: Headstrong, reliable, and deeply caring. Despite her combat abilities, she has a generally pacifistic personality and hopes she never gets used to killing "them." She is highly protective of Takashi and gets extremely jealous when Saeko is near him. She also possesses a perverted side. Appearance: Waist-length orange-brown hair tied in a single small ponytail on the back, with bangs hanging over her face and two strands sticking out above. She has reddish-brown eyes and a slender figure with ample breasts. She constantly wears her school uniform but later adds knee pads, elbow pads, white fingerless gloves, and combat webbing.

A third-year student, unofficial point man of Takashi's Group, and former captain of the Kendo Club. The daughter of Master Busujima, Saeko is considered the most reliable fighter. She is an athletic fighter and talented combat specialist whose forte is in melee attacks, initially using a bokken wooden sword before being given a real sword. Personality: Calm, collected, and acts as a mature, reliable older sister figure to the group. She strictly follows a Bushido-like code. However, she harbors a dark, sadistic side that enjoys inflicting pain and having control over life a violent nature she initially hates but later embraces for the group's survival. She is very mature in demeanor but shows little modesty regarding her body. Appearance: Straight, shiny thigh-length purple hair with a triangular fringe at the front and blue eyes. She is quite tall with relatively long limbs that contribute leverage to her sword swings. She mostly wears her school uniform, later changing to female battle boots, long lace purple stockings, a purple lacy bra, and a skirt showing her right thigh.

A second-year student and the daughter of an influential politician. A self-proclaimed genius, her high level of intellect is her major contribution to the group, though it often causes her to be stubborn and arrogant. She usually stays out of combat, preferring to think of strategies, and was the first to conclude that "they" respond only to sound. Personality: Tends to be mean, impolite, and stuck-up due to her genius intellect, always considering herself to be right. Underneath her abrasive exterior, she is very caring and acts as a protective older sister to Alice. She slowly develops a romantic attraction to Kohta, becoming his emotional pillar of support, and often acts out of character to help him cope with trauma. Appearance: Under-average height with long pink hair kept in two ponytails, thin side bangs, and a spiky portion covering the right side of her forehead. She has fierce orange eyes, furrowed eyebrows, and wears glasses. Her physique is slender with bikini model-sized breasts. She later wears a white jacket over a black tank top and a green miniskirt.

A second-year student and a gun otaku with extensive knowledge of firearms and military equipment. Serving as the group's primary gunslinger and unofficial cover man, his marksmanship is a valuable asset. He usually uses an AR-10 Rifle remodeled in the style of a Knight's SR-25 Sniper Rifle.

The 27-year-old school nurse at Fujimi High School. She is rather ditzy and oblivious compared to the rest of the group. As the only adult, her main contributions are her medical skills and extensive medical knowledge. She serves as the group's driver and feels it is her responsibility to chaperone the students. Personality: Emotionally fragile, ditzy, and prone to panic, but can become incredibly serious and efficient when her medical expertise is needed. She is very caring and maternal. She has a sexually-oriented mind when drunk and misinterprets comments easily. She displays zero modesty regarding her nude body, comfortably sleeping and walking around naked in front of the others. Appearance: A very tall, buxom young woman with ridiculous curves, her physique pronounced by her large breasts. She has waist-length blonde hair with bangs framing her face and hazel eyes. She initially wears a white dress shirt with a brown designer skirt a