Yuria Harudera, often referred to as JB, is known for her teasing and flirtatious behavior particularly toward Yuuji Kazami. She often makes suggestive or misleading remarks around him in public, partially to annoy him and partially to amuse herself by misleading others about the nature of their relationship. Her playful attitude is largely a form of retaliation for Yuuji’s frequent sarcasm and bluntness, rather than true sadism.

While she may appear to be airheaded at times, JB is actually sharp and highly observant, with a strong awareness of her surroundings and the people she works with. Her interactions with Yuuji are marked by constant bickering, teasing, and insults, yet beneath the surface, it is evident that they share a mutual respect and care for one another. Despite this, she does not fully support Yuuji unconditionally as evidenced by her decision to assign him to Mihama Academy for observation and protection, suggesting a pragmatic rather than purely emotional approach to their relationship.

Yuria Harudera, also known as JB, is a tall and attractive woman with long, curly blonde hair and striking blue eyes. One of her distinguishing features is a small mole located beneath her left eye. She has a notably voluptuous figure, with a bust size that is portrayed as even larger than that of Amane Suou particularly emphasized in the anime adaptation.

She is typically seen wearing a professional business outfit, often accompanied by a blue necklace, reinforcing her role as a high-ranking operative within Ichigaya while maintaining a stylish and composed appearance.

Although much of Yuria Harudera’s past remains unclear, it is known that she has a long history with Asako Kusakabe, Yuuji Kazami’s mentor. The two women knew each other since childhood, though their relationship was not always close. Asako often referred to Yuria as a “brat” and once remarked that their friendship would likely be short-lived. Despite this, JB held a deep respect for Asako and later reflected on those words with a sense of nostalgia and sorrow following Asako’s death from illness.

• Yuuji Kazami: Yuria serves as Yuuji Kazami’s superior officer at Ichigaya and his legal guardian following the death of Asako Kusakabe. Their relationship is complex and often marked by sarcastic exchanges and teasing, particularly on Yuria’s part. She frequently flirts with Yuuji in front of his classmates to provoke him, a habit she admits is partly in retaliation for his own sardonic attitude.

  Yuria first met Yuuji as a child, after he was rescued by Asako. At the time, she was shocked by his fragile state and emotionally withdrawn personality. Initially skeptical of Asako’s decision to become Yuuji’s legal guardian, she ultimately accepted it and continued to support him from a distance, including providing him with correspondence education to make up for his lack of formal schooling.

  Despite her hope that Yuuji would lead a normal life, she was disheartened when he chose to follow in Asako’s footsteps and become an operative for Ichigaya. After Asako’s passing, Yuuji lived with Yuria for a time, during which they briefly entered a physical relationship in an attempt to cope with their shared grief an experience that only complicated their dynamic further. Years later, Yuria is seen living on Asako’s private island alongside Yuuji, Kazuki Kazami, and the girls from Mihama Academy.

• Chizuru Tachibana: Yuria is acquainted with Chizuru Tachibana, the principal of Mihama Academy. While the two are not portrayed as particularly close, they maintain a professional relationship through their mutual connection to Yuuji and the academy.

• Asako Kusakabe: Asako Kusakabe was Yuria’s childhood friend. Though their personalities often clashed resulting in frequent arguments they shared a long-standing bond. Yuria cared deeply for Asako and was profoundly affected by her death. Her concern for Asako’s wellbeing, despite their disagreements, reflects the depth of their connection.

The given name Yuria (由梨亜) is composed of the kanji 由 (yu), meaning “reason” or “origin,” 梨 (ri), meaning “pear,” and 亜 (a), which can mean “second” or is often used as a phonetic component referencing “Asia.” The name may be interpreted symbolically, but is primarily chosen for its phonetic appeal.

Her surname, Harudera (春寺), combines 春 (haru), meaning “spring” (the season), and 寺 (tera or dera), meaning “temple,” giving the name a peaceful and traditional feel “spring temple.”