Komi Natsuki is a supporting character in the anime and manga series Sakura Diaries. She is a teenage girl with long black hair and brown eyes. Her background is closely tied to that of Urara Kasuga, who is her best friend and the person around whom much of her role in the story revolves. Natsuki is characterized by a blunt, outspoken, and no-nonsense personality. She is highly energetic and prefers to make things happen quickly rather than waiting for events to unfold naturally. She has a penchant for following trends and deliberately seeks the attention of college-aged men, expressing little interest in high school boys. Her direct manner of speaking often shocks or embarrasses Urara, but this straightforwardness is paired with an intense and unwavering loyalty to her friend.

Natsuki’s primary motivation is to support Urara, particularly in Urara’s romantic pursuit of Touma Inaba. She offers advice and stands by Urara during moments of loneliness or difficulty. Later in the series, Natsuki develops her own romantic interest in Tatsuhiko Mashu and expresses a desire to marry him and become a housewife. In the story, Natsuki serves as a close confidante and active helper for Urara. She becomes involved in some of the series’ darker plot developments: at one point she reveals to Mashu that Touma is not a university student, a piece of information that drives much of the central conflict. She later works alongside Urara at an escort service to raise money, and she is subjected to a violent gang-rape during a failed hustle. She also plays a part in a scheme in which she gives Touma an incense, believing it to be a memory-enhancing study aid, but it is actually speed, leading to Touma’s addiction. These events illustrate both her fierce loyalty and the harsh consequences she faces as the story progresses.

Her key relationships are with Urara Kasuga, to whom she is a devoted and protective best friend, and with Tatsuhiko Mashu, toward whom she develops romantic feelings. She also interacts with Touma Inaba, often in ways that impact the central love triangle. In terms of development, Natsuki begins as a lively and supportive peer and becomes increasingly entangled in difficult and exploitative situations, reflecting the series’ exploration of social decline and the consequences of the characters’ choices. She does not possess any supernatural or notable physical abilities beyond her energetic demeanor and street-smart boldness. Her defining traits are her blunt honesty, her loyalty to Urara, and her willingness to become involved in risky circumstances for the sake of those she cares about.