Yuuji Kazami is portrayed as a cold, reserved individual shaped by a life of trauma and violence. He tends to keep others at a distance, displaying a detached demeanor and a dry, sardonic sense of humor. Unconcerned with how others perceive him, Yuuji often presents himself as emotionally stoic. Despite his military training and experience, he openly admits that he is not inherently brave, and instead prefers thorough planning and contingency preparation before taking action.

A habitual reader, Yuuji’s love of literature was instilled in him by both his sister, Kazuki Kazami, and his mentor, Asako Kusakabe. Reading serves as both a source of intellectual grounding and a coping mechanism for his inner turmoil.

Yuuji suffers from post-traumatic stress disorder (PTSD), primarily stemming from his troubled childhood. One notable psychological safeguard placed on him is the so-called “safety pin”, a mental conditioning instilled by Asako to suppress his urge to kill. This internal restraint remains largely intact throughout the series but is shown to be overrideable under specific circumstances. For instance, during a Marine deployment, Justin Mikemeyer is able to temporarily bypass the restriction to allow Yuuji to act in defense of his comrades. In alternate scenarios, such as the bad endings of Amane Suou and Makina Irisu, the metaphorical “safety pin” becomes unstable, suggesting it could “come loose” under enough psychological pressure.

While Yuuji is highly capable in combat, he uses violence sparingly and avoids causing excessive harm unless absolutely necessary. His ultimate desire is to lead a peaceful civilian life, free from the bloodshed that has followed him for most of his existence.

Yuuji holds deep admiration for his older sister, Kazuki, though he also harbored feelings of envy due to her intelligence and emotional strength. Kazuki, in turn, cared for Yuuji deeply, especially because he lacked the affection of their parents. Her disappearance had a profound impact on him, leaving emotional scars that persisted for years. In the aftermath, Yuuji formed a powerful bond with his mentor, Asako Kusakabe, who played a vital role in helping him recover from his trauma. Though Yuuji developed romantic feelings for her, Asako rejected his advances due to her declining health. Her eventual death left a deep void in Yuuji’s life and marked one of the most devastating moments in his personal journey.

Yuuji Kazami is a tall, well-built young man with a composed and somewhat intimidating presence. He has short black hair and piercing black eyes, which contribute to his cool and detached appearance. Thanks to years of intense physical training, Yuuji maintains an athletic physique. However, his body bears numerous scars, testaments to his harsh upbringing and experiences as a government operative.

From birth, Yuuji Kazami suffered neglect and emotional abuse at the hands of his parents. His father, Ryouji Kazami, openly despised him for lacking any apparent talent, while his mother, Satoko Kazami, was too weak-willed to intervene. The only person who treated Yuuji with kindness was his older sister, Kazuki Kazami, whom he came to idolize as a near-divine figure due to the stark contrast in how she was treated by their parents. During this time, he also befriended a cheerful girl named Sachi Komine, although Kazuki disapproved of their friendship.

Yuuji’s life took a tragic turn following the reported death of Kazuki in a bus accident. The loss shattered what little stability remained in the household. His father sank into alcoholism and became increasingly violent, subjecting both Yuuji and his mother to escalating abuse. Eventually, Satoko attempted to escape with Yuuji and start a new life. However, after a year, Ryouji found them and attempted to assault Satoko. In an act of desperation, Yuuji struck his father with a wine bottle, killing him. His mother instructed him to flee to a nearby train station and wait for her, but when Yuuji returned to the house out of concern, he discovered her lifeless body—she had taken her own life by hanging.

Following this traumatic event, Yuuji fell into the hands of Heath Oslo, a known buyer of Kazuki’s paintings operating under the alias Rei Kirihara. Oslo forced Yuuji to dress as Kazuki and subjected him to severe abuse. After Yuuji killed one of Oslo’s associates in self-defense, Oslo recognized his potential and began training him as a child soldier. He was sent to a remote terrorist training facility, where he endured constant harassment from other recruits. Oslo personally taught him hand-to-hand and knife combat, further isolating him as the perceived “favorite.”

While at the facility, Yuuji formed a rare bond with a girl named Marlin, but this ended tragically when they were forced to fight each other in a deathmatch as part of a graduation exam. Although Yuuji lost and was seriously injured, Marlin treated his wounds, sparing his life. He later learned of her death, which instilled in him the belief that any woman who becomes close to him is doomed. Given a second chance to graduate, he successfully completed an assassination mission and returned to Oslo, becoming a tool for further missions and drug experimentation.

Yuuji’s life changed when he was found drugged and imprisoned in Oslo’s mansion by Asako Kusakabe, an elite operative who rescued him and became his legal guardian and mentor. Under Asako’s guidance, Yuuji began the process of recovery and started a new life. He referred to her as “Master,” believing the titles of “mother” or “caregiver” were insufficient to describe their complex bond. After Asako’s death, Yuuji inherited her position as a “cleaner” for a government-affiliated black ops organization, gaining a fearsome reputation under the codename Ace Number 9029.

Eventually, Yuuji sought to leave behind his violent past and experience a normal life. He contacted Chizuru Tachibana, the principal of Mihama Academy and an old acquaintance, and enrolled as a second-year student under the guise of a transfer student returning from Canada. While he keeps his true identity and history hidden from the five other students at the academy, his past continues to influence his present. For instance, due to trauma related to being abandoned at a train station by his mother, Yuuji avoids train travel whenever possible.

Advanced Military Training
Yuuji possesses extensive training in military tactics and combat, acquired through years of conditioning under Heath Oslo, Asako Kusakabe, and formal service in the United States Marine Corps. His skills have grown to surpass even those of his mentors, making him an elite operative proficient in various fields of warfare and espionage.

Knife Proficiency
During his time in Oslo’s training facility, Yuuji was designated as the favored trainee and received specialized instruction in knife combat directly from Oslo. His mastery of knife fighting and close-quarters combat has made him a formidable opponent in hand-to-hand engagements.

Marksmanship
Yuuji is a highly skilled marksman, particularly with sniper rifles. Trained further by Asako, Yuuji’s natural talent and disciplined practice have made him a master sniper capable of executing high-risk precision shots. Even before receiving official military certification, he occasionally completed missions in Asako’s place without arousing suspicion from most of her peers.

Firearms Expertise
In addition to long-range weaponry, Yuuji is well-versed in the use of small arms, including pistols and automatic rifles. His firearms training stems from both terrorist instruction and military service. Notable examples of his proficiency include eliminating Kiyoka Irisu and her guards with a pistol in Makina Irisu’s route and successfully executing an infiltration and assault on Heath Oslo’s offshore facility, where he neutralized multiple armed mercenaries.

In the anime, Yuuji is seen using weapons such as the FN SCAR-L CQC (MK 16 CQC) with expert handling.

Hand-to-Hand Combat
Yuuji is extremely skilled in unarmed combat, frequently demonstrating the ability to overpower multiple opponents. Whether facing street-level assailants or trained agents from organizations like Ichigaya, he has repeatedly proven himself in close-range battles.

Guerrilla Tactics
Yuuji is also adept in guerrilla warfare techniques. In Makina’s route, he successfully evades and neutralizes elite operatives using ambushes, improvised explosives, and attrition-based strategies. His ability to plan, adapt, and execute under pressure makes him effective even when outnumbered.

Peak Physical Condition
Thanks to years of rigorous physical training, Yuuji has developed a physique capable of withstanding significant physical trauma. His resilience, endurance, and pain tolerance exceed that of most ordinary humans.

Athleticism
Even as a youth, Yuuji exhibited natural athletic ability and strong hand-eye coordination. This foundation, combined with later intensive training, contributes to his exceptional combat agility and reflexes.

Drug Resistance
As a result of his early exposure to various experimental substances during his time under Heath Oslo’s supervision, Yuuji has developed a notable resistance to drugs, both physically and mentally.

Stamina
Yuuji’s physical stamina extends beyond combat scenarios. In romantic relationships, he is noted for having an unusually high level of endurance, though over time he learns to manage it respectfully. Among his partners, Amane Suou is portrayed as the only one who matches or exceeds his stamina.

• Yumiko Sakaki: Yumiko initially displays hostility toward Yuuji, partly due to his presence as the only male student at Mihama Academy, which had previously been an all-girls institution. Her aggression escalates to an attempted attack with a box cutter, though it is ultimately ineffective and dismissed as sparring by the other girls. However, after witnessing Yuuji’s intimidating presence during a confrontation in the dorms, she opts to avoid him instead.

• Amane Suou: Amane is the most openly affectionate toward Yuuji from the beginning, frequently flirting with him, cooking for him, and even making sexual advances. Initially, Yuuji tolerates her behavior, but eventually voices discomfort with the unnatural intensity of her attention. Amane later reveals that she harbors deep guilt over Kazuki Kazami’s presumed death and views Yuuji as someone who could both judge and redeem her. She also acknowledges her romantic feelings for him.

• Michiru Matsushima: Michiru maintains a comically antagonistic dynamic with Yuuji, frequently mocking or teasing him due to his stoic and unpredictable nature. Despite this, her feelings for him deepen over time, especially after he helps her come to terms with her survivor’s guilt. Michiru’s tsundere personality remains prominent, but Yuuji’s teasing and support allow her to gradually open up.

• Makina Irisu: Initially afraid of Yuuji, Makina becomes close to him as he patiently gains her trust. She adopts some of his speech patterns and attitude, emulating him as a role model. Yuuji takes on a guardian-like role in her life, mirroring the care Asako once gave him. He also subjects her to a version of his own military training to help her grow stronger.

• Sachi Komine: Sachi is Yuuji’s childhood friend, though he initially does not remember her. She gently attempts to jog his memory by calling him “Yuu-kun,” a term of endearment from their past. Although saddened by his initial amnesia, she continues to treat him kindly and without resentment.

The given name Yuuji (雄二) is composed of the kanji 雄 (yuu), meaning “hero,” “manly,” or “brave,” and 二 (ji), meaning “two.” The name can be interpreted as “brave second son” or “heroic two,” reflecting traditional naming conventions in Japanese families.

His surname, Kazami (風見), combines 風 (kaza), meaning “wind,” “breeze,” or “gale,” and 見 (mi), meaning “to see” or “to observe.” Together, the name can be interpreted as “to see the wind,” symbolizing perception, awareness, or the ability to sense invisible forces, an apt reflection of Yuuji’s cautious and observant nature.