TV-Series
Description
Natsumi Oohashi is a supporting character in the story. She is a teenage girl attending the same high school as the main characters, identifiable by her long maroon or red hair and red eyes. Within the anime adaptation, her facial expressions are often drawn with a cat-like mouth, and she is notably the shortest among her close circle of friends.

Her background places her as part of a gyaru friend group alongside Sachi Takamiya, and she shares a particularly close friendship with the female lead, Akari Watanabe. Natsumi is in a relationship with a boyfriend named Ryo, who attends a different school from hers. This external relationship provides her with a perspective on romance that differs from the central couple's arrangement.

In terms of personality, Natsumi is portrayed as an extroverted and bubbly individual who frequently wears a smile. She has a sweet and approachable nature, enjoying social activities such as visiting cafes to try popular dishes and going to karaoke with her friends. Her motivations largely revolve around maintaining her friendships and supporting those she cares about. She is consistently shown to be a very supportive friend, particularly toward Akari, offering encouragement and companionship without judgment.

Within the story, Natsumi's role is that of a key supporting character and a member of Akari's gal friend circle. She acts as part of Akari's social environment, providing context for Akari's own personality and social standing. Her presence adds to the everyday, school-life atmosphere of the series and gives insight into the main female character's life outside of the forced couple exercise.

Her key relationships are with Akari Watanabe, with whom she is good friends and shares a bond of mutual support, and with Sachi Takamiya, as they belong to the same gal group. Her relationship with her boyfriend, Ryo, is a background detail that informs her character but does not directly drive the central plot. In terms of development, Natsumi remains a consistently cheerful and supportive presence throughout the story, without undergoing a major personal transformation; her role is to provide stability and friendship to the protagonists.

Notable abilities or traits include her social nature and her ability to enjoy and organize fun activities with her friends. Her primary strength lies in her extroverted, friendly demeanor, which makes her a comfortable and reliable figure within her social circle.