Justice is a prominent character in Dojin Work, known for being a highly successful and prolific creator of dōjinshi, the self-published manga that are the focus of the story. He is depicted as a tall man with gray hair and red eyes, often dressed in a formal suit and tie and wearing glasses, which gives him an appearance that is more mature than his actual age suggests; despite his adult look, he is a high school student and a childhood friend of the main protagonist, Najimi Osana.

Justice’s personality is marked by a calm and composed exterior that often contrasts with his more intense internal reactions, particularly regarding the people he cares about. He is exceptionally protective of Najimi, a trait that can manifest as extreme jealousy or aggression toward any man who shows an interest in her. This overprotectiveness has been described by another character, Tsuyuri, as making him a father figure to Najimi, reflecting his deep-seated, if sometimes misguided, sense of responsibility for her well-being. His motivation is deeply tied to the world of dōjinshi creation. He is driven by a philosophy that to make a good dōjinshi, a work must be well-drawn, erotic, have an interesting story, and most importantly, be filled with love. This principle guides his own work and the advice he gives to newcomers like Najimi.

Within the story, Justice serves as both a goalpost and a source of comic relief. His immense success as an artist, often selling tens of thousands of copies at a single convention, establishes him as an authority figure in the dōjinshi community. However, his financial acumen is poor; because of high production costs and his tendency to sell his work at very low prices, he earns surprisingly little money despite his high sales volume. His role often involves him trying to mentor Najimi, offering her technical advice and philosophical insights into the craft, though her amateurish and often naive approach to the hobby frequently leads to misunderstandings between them.

Justice’s key relationships define much of his character. His bond with Najimi is central; as her childhood friend, he is fiercely loyal and constantly looks out for her, sometimes to an absurd degree. His relationship with the young girl Sōra is another significant and more controversial aspect of his portrayal. Sōra is deeply devoted to Justice, frequently appearing by his side in various cosplay outfits he makes for her, and she openly declares her love for him, having even given him his first kiss. The nature of this relationship differs between the anime and the original manga. In the anime, it is often presented as a comedic, innocent, and somewhat one-sided admiration from Sōra. However, other sources indicate that in the manga, Justice’s behavior towards Sōra is much more problematic, exhibiting traits that have been critically described as those of a lolicon, where he becomes agitated or excited by her, a dimension that is toned down for the television adaptation.

Throughout the series, Justice undergoes minimal overt development, remaining a largely static but reliable force in the narrative. His core traits of protectiveness and artistic dedication are consistently reinforced. He is the professional whom other characters measure themselves against, and his interactions, especially his volatile reactions to potential male rivals for Najimi’s affection, are a recurring source of humor. His notable abilities are entirely focused on dōjinshi production. He is an exceptional artist capable of producing massive volumes of work, such as a five-hundred-page dōjinshi, and his commercial success at conventions proves his mastery of the medium and his ability to appeal to the market, even if his pricing strategy undermines his profits.