Mini Yaemori has a bright, optimistic personality characterized by her playful and impulsive nature. She often acts on curiosity and speaks bluntly, sometimes coming across as rude or overly forward. Despite this, she is a genuinely kind individual who shows consideration for others and respects personal boundaries only involving herself in others’ affairs when she believes it’s truly necessary.

Mini is confident and capable when it comes to leadership, demonstrating the ability to organize others and take initiative in collaborative efforts. She is highly supportive of both Kazuya and Chizuru, frequently encouraging them and attempting to help their relationship progress. Her persistent and upbeat attitude reflects a strong “never say die” mentality.

She openly refers to Kazuya as her “master” and often takes bold steps to bring him and Chizuru closer, though her interference sometimes leads to unintended complications. Mini is described by Kazuya as a “modern-day girl” due to her fondness for discussing topics like romance and waifus, as well as her frequent use of social media and love for selfies even in questionable situations.

Mini also admits to having a short attention span and tends to lose interest in activities when doing them alone. However, she thrives when engaged in group efforts, finding motivation and enjoyment through shared experiences.

Mini Yaemori has a slim, petite frame with a notably prominent bust. She has long black hair that extends to the middle of her back, featuring two distinctive blue streaks. Her hairstyle includes straight-cut bangs and a noticeable cowlick at the crown of her head. A prominent fang that shows when she speaks or smiles further adds to her unique and playful appearance.

As an avid cosplayer, Mini dedicates much of her social media presence to showcasing her costumes. Her apartment is filled with cosplay outfits and accessories, reflecting her passion for the hobby. Outside of cosplay, she typically opts for casual comfort often wearing oversized shirts, shorts, and a track jacket while at home. In public, she tends to dress in a more traditionally feminine style.

Mini Yaemori first becomes acquainted with Kazuya Kinoshita and Chizuru Ichinose after overhearing their conversation on the veranda of their apartment complex. Upon hearing Chizuru refer to Kazuya as the “producer” of her film project and seeing his flustered reaction, Mini teasingly questions why the two aren’t already in a relationship marking the beginning of her playful involvement in their lives.

The following day, Mini and Kazuya meet again by coincidence and discover that they attend the same university, with Kazuya being her senior. Though Kazuya tries to clarify any misunderstandings about their situation, Mini quickly shifts the conversation toward her own interests, such as idols and pop culture.

Later, when Ruka Sarashina unexpectedly visits the apartment and encounters both Kazuya and Chizuru, Mini learns that the girls are rental girlfriends. Jumping to conclusions, she initially labels Kazuya a playboy. However, after he explains the full history behind his complex relationship with Chizuru, Mini changes her stance. She playfully declares Kazuya her “master” and appoints herself as a self-proclaimed cupid, regularly attempting to push him and Chizuru closer together.

As the story progresses, Kazuya confides in Mini that the crowdfunding campaign for Chizuru’s film has not been successful. Drawing on her experience organizing events for her cosplaying friend, Mini offers her support and helps plan an exhibition event to generate interest and funding for the project.

Mini’s surname, Yaemori (八重森), is composed of three kanji: ya (八), meaning “eight”; e (重), meaning “layers” or “folds”; and mori (森), meaning “forest.” Together, the name can be interpreted as “eight-layered forest” or “dense forest,” though the exact meaning is likely chosen for aesthetic or phonetic appeal rather than literal interpretation.

Her given name, Mini (みに), is written in hiragana and does not carry a specific meaning, though it phonetically resembles the English word “mini,” possibly alluding to her small stature and playful personality.