TV-Series
Description
Matoi Tsunetsuki is a student in class 2-F at the school where Nozomu Itoshiki serves as the homeroom teacher. She is a teenage girl with short black hair, straight bangs, and brown eyes. Her full name is a wordplay on a Japanese phrase meaning always following or always hanging around, which directly reflects her defining behavioral trait.

Her background is rooted in an intense and obsessive romantic nature. She develops powerful fixations on anyone she believes has feelings for her, and once she becomes fixated, she pursues that person relentlessly without regard for social boundaries. Before the events of the series, she was involved in a relationship with a former boyfriend and engaged in stalking behavior toward him after the relationship ended. Her fixation later shifts to Nozomu Itoshiki after she misinterprets one of his cynical remarks as a sincere declaration of love. He had made a comment about the ultimate form of love being a double suicide and offered to die with her, which she took as a romantic confession.

Personality wise, Matoi Tsunetsuki is obsessive, eccentric, and single-minded. She lacks any awareness of appropriate personal boundaries and sees her intrusive behavior as normal and natural. Her primary motivation is a craving for love and reciprocation, which she pursues with complete sincerity but also with a total disregard for the feelings or consent of her target. She is not aggressive or malicious in intent, but her actions are invasive. She demonstrates a chameleon-like tendency to adapt her appearance and manner of dress to match her current love interest. Because Nozomu wears traditional Japanese clothing such as a kimono or hakama, she begins dressing in a matching kimono as well. When his attire changes, she alters her own to match. Earlier, when she was fixated on her ex-boyfriend, she dressed in a style that mirrored his.

Her role in the story is that of a supporting character whose antics contribute to the series satirical and absurdist tone. She serves as a vehicle for commentary on modern social issues such as romantic obsession, the pressure to conform to traditional relationship roles, and the blurring of love and possession. She often appears suddenly, having been hidden nearby watching Nozomu, and her presence is frequently acknowledged with a deadpan exchange where he asks if she was there and she calmly confirms that she has been there all along.

Her key relationship is with Nozomu Itoshiki, though it is entirely one-sided. Nozomu rarely acknowledges her advances and is visibly unnerved or exasperated by her presence. She, in turn, performs exaggerated duties of a traditional Japanese wife, such as walking three steps behind him, following him everywhere, and referring to him in familiar terms. She also reads his mail and disposes of it before he can see it, justifying the behavior as part of her dedication. She becomes jealous when other students, particularly female classmates, spend time near Nozomu. Her relationships with other students are largely defined by their reactions to her strange behavior. They either find her unsettling or treat her antics as a source of comedy.

In terms of development, Matoi Tsunetsuki remains consistently obsessive throughout the series, but her character is occasionally used to explore the darker implications of her behavior. Her fixation never truly wavers, but the narrative sometimes hints at a deeper understanding of boundaries and emotional connections. Her arc is not one of dramatic change but of sustained comic and thematic consistency.

She does not possess supernatural abilities or combat skills. Her notable capabilities are her relentless determination and her uncanny ability to blend into the background and monitor her target without being noticed for extended periods. Her adaptability in adopting the lifestyle and appearance of her love interest is another defining trait. However, the same obsession that drives her also limits her, as it prevents her from seeing the harm or discomfort she causes and from engaging with others in a reciprocal way.