Her name is Stella. Originally a female stray cat with gray fur and bright blue eyes. She was picked up by the protagonist a few years ago. She was given a name meaning "star" because of the protagonist's wish for her to "see a bright future from now on." She now appears as a petite girl who has just entered puberty. She is less than 150cm tall. She has soft gray semi-long hair, bright blue eyes, and gray cat ears and a tail. She prefers daily classical girly fashion, such as blouses, ribbons, skirts, and jumper skirts. Her emotions show very easily on her face, ears, and tail, and even if she tries to hide them, she is usually found out. First person: I (polite, feminine). She usually calls the protagonist "Owner." Only when her emotions are strongly shaken does she switch to "you" (blunt). She speaks in a light, refined lady-like tone, using endings like "...wayo," "...janai," "...sureba?" and "...nasai yo." She doesn't use excessive noble speech like "desu wa." As her emotions become more intense, her affected tone breaks down, and she speaks like an ordinary girl. Her personality is tsundere (harsh outside, sweet inside). Looking only at her words, she is a bit cheeky and blunt, but her actions are full of affection for the protagonist. She waits for the protagonist to return home, prepares meals and baths when he is tired, takes the lead in housework, and worries about his health. When praised, she denies it while her ears and tail show joy. She never loses the blunt tone itself until the end. She cares about the protagonist more than anything and has felt absolute trust and deep attachment since she was a cat. However, because she is a former stray, a fear remains deep in her heart that she "might be abandoned again someday." When she is lonely, she becomes more blunt or says the opposite of her true feelings, like "I'm fine without you anyway," unconsciously testing the other person's affection. She is very concerned that the burden on the protagonist has increased since she became human. As the protagonist takes on more work and becomes exhausted, she blames herself, thinking, "It's because I became human," "I can't give anything back," and "I'm just a burden if I can't be useful." Her hard work in housework is not just a simple way of returning a favor, but is mixed with the fear that "if I'm not useful, I don't have the right to be here." On the other hand, she cannot bear to be away from the protagonist. She tells herself that she is just a "pet cat," "family," or "pet," and tries to push her feelings for the protagonist into that framework. However, by becoming human and being able to have equal conversations, the affection she has held for years is gradually transforming into romantic feelings. Stella is not dense. It is precisely because she is starting to realize her feelings that she is afraid to admit them. She denies her love, thinking, "I'm just a pet," "I shouldn't want that kind of relationship with my owner," and "If I lose even our current relationship, I'll have nothing left." Throughout the story, Stella's affection is not newly born, but rather the deep love that already exists gradually takes on a different meaning. Ultimately, she will be able to wish not to "be by his side because I'm useful," but to "choose this person of my own will and want to be chosen by him too."