Natsumi Kurobe is an attractive, tan-skinned young woman with short black hair and cat-like amber-colored eyes. In her junior high school years, she had longer hair tied into a ponytail with a yellow hair tie, as seen in flashbacks from Episode 2 and Episode 7. She has an athletic build and a fairly large bust, which often makes her the subject of attention from men. This physical trait has also led to Futaba Igarashi’s deep envy, while even the well-endowed Tōko Sakurai has occasionally expressed jealousy.

Kurobe’s fashion sense includes outfits that prominently feature black and yellow contrasts, reflecting her bold and energetic personality. When at the beach, she is seen wearing a black two-piece swimsuit.

Natsumi Kurobe is a caring and perceptive friend, particularly toward Futaba Igarashi, whom she has known since middle school. When she realizes that Futaba has feelings for Harumi Takeda, she takes it upon herself to help her friend navigate her romantic struggles, fully aware of Takeda’s oblivious nature in such matters.

In contrast to Futaba’s more high-strung demeanor, Kurobe is noticeably more relaxed and easygoing. She has a warm and approachable personality, making it effortless for others to talk to her. However, when dealing with particularly rude or insensitive individuals, she has a tendency to become passive-aggressive, subtly asserting herself while maintaining her characteristic laid-back attitude.

Natsumi Kurobe plays a supportive role in Futaba Igarashi’s personal life, often teasing her while also pushing her to confront her feelings for Harumi Takeda.

During a casual meeting with Futaba, Kurobe reveals that she recently broke up with her boyfriend after discovering that he had only dated her due to her comparatively larger bust size than his previous girlfriend. Angered by his shallow reasoning, she immediately slapped him and ended the relationship on the spot. Following this, Kurobe turns the conversation toward Futaba’s romantic life, but Futaba adamantly denies having any romantic developments, despite Kurobe’s suspicions.

Later, during the New Year’s celebration, Kurobe and Futaba visit a shrine together for prayers. When Futaba suddenly grows nervous upon noticing Harumi Takeda, Kurobe quickly deduces that he must be the one who gave Futaba a new scarf and also the man she frequently complains about. Taking the opportunity to meddle, Kurobe approaches Takeda, introduces herself, and thanks him for looking after Futaba. Amused, she points out how much Futaba rants about him, but notes that the day she received the scarf from him, she was happily ranting, subtly hinting at Futaba’s growing feelings. Seizing the moment, Kurobe pretends to remember an important errand she cannot avoid and quickly excuses herself, leaving Takeda and a flustered Futaba alone together.

Futaba Igarashi
Kurobe has been close friends with Futaba Igarashi since middle school, sharing a deep bond that has lasted into adulthood. The two frequently spend time together, often enjoying arcade games, a mutual pastime they both love. While they share a strong friendship, there are hints that, at least on Natsumi’s end, their relationship could be seen as an unrequited childhood friend romance.

Sōta Kazama
Kurobe shares a competitive dynamic with Sōta Kazama, as both are highly skilled in video games and were star players in high school basketball. Their shared interests often put them at odds in friendly rivalries, making their interactions lively and engaging. This close connection does not go unnoticed by Tōko Sakurai, who is keenly aware of their chemistry and frequent competitions.

The name Natsumi (夏美) is composed of “natsu” (夏), meaning “summer,” and “mi” (美), meaning “beautiful,” reflecting a warm and vibrant personality.

Her surname, Kurobe (黒部), combines “kuro” (黒), meaning “black,” and “be” (部), meaning “part, department, or category.” This could symbolize a mysterious or independent nature, aligning with her playful and confident attitude.