Ayano Kobayashi, a rookie lawyer at Suzuno Law Office, oversees the estate of Kotaro Sato’s late mother, discreetly delivering weekly living expenses funded by her life insurance while withholding the circumstances of her death. Tasked with monitoring Kotaro’s welfare under her boss’s directives, she navigates their interactions with visible nervousness, masking her unease beneath a professional demeanor.

In the live-action adaptation, her inherited aversion to children clashes with societal expectations, compelling her to conceal her discomfort as she reluctantly assists in caring for Kotaro alongside his apartment neighbors. A pivotal visit sees Kotaro coaxing her into drinking alcohol, loosening her inhibitions enough to voice candid thoughts—though she carefully sidesteps any mention of his mother’s fate.

Her responsibilities extend to securing Kotaro’s financial stability and shielding him from exploitation, yet her inexperience and anxiety intermittently pierce her composed façade. Physically, she embodies an approachable professionalism with black hair and vivid green eyes.

Consistently portrayed as Kotaro’s financial lifeline, Ayano remains an ambivalent figure in his daily life, grappling with insecurities while upholding her duties. The live-action iteration deepens her complexity, framing her discomfort around children as a deliberate flaw that challenges her resolve to fulfill obligations she never anticipated.