Saitou Kayano is the central female protagonist in the series, and the narrative primarily follows her life and perspective. Kayano is an ordinary girl without any extraordinary beauty that would draw significant attention. Her father passed away eight years ago, and she lives a contented life with her mother. Like many girls her age, she worries about matters such as her crush, supported by her two best friends.
At the start of the series, Kayano appears extremely shy, frequently relying on her friends for guidance. She refrains from voicing her opinions due to fear and easily falls into the role of Takeru's servant. However, as time progresses, she gradually overcomes her fears. She starts expressing her thoughts more openly and can be quite stubborn at times. There are even instances where she slaps Takeru.
Kayano experiences numerous insecurities, particularly concerning her relationship with Takeru. These often lead her to act impulsively or jump to incorrect conclusions. Nevertheless, as the story unfolds, she begins to gain self-confidence. By the end, she transforms into a determined woman who trusts both those she cares about and herself.
What draws people to Kayano is her boundless compassion. Takeru often complains about Kayano exhausting herself over others' problems, but that’s just part of her nature. If she encounters injustice, she will do her utmost to rectify it, sometimes even at personal cost. Indeed, she is a well-grounded woman who understands right from wrong. This doesn’t mean she never makes mistakes—she does—but she always strives to make amends.
While initially appearing less strong, readers gradually come to see Kayano’s true inner strength. She doesn't possess magical powers or superhuman abilities. Instead, she impacts and changes the lives of those around her through simple acts of caring, which is truly admirable.
