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Naoki's father and a close friend of Kotoko's father. He generously offers his estate to Kotoko and her father after their apartment collapses.

Kotoko's father, a hardworking man who raised her alone after his wife's passing. He relies on his old friend Shigeki in their time of need.

Kotoko's loving, hardworking father. He runs a small restaurant and is entirely unaware of the complex, elite world his daughter is about to enter.

Naoki's wealthy and influential father. He is Kotoko's father's best friend and the orchestrator of their living arrangement, perhaps knowing more about Class A's secrets than he lets on.

Kotoko's passionate and fiercely loyal friend from high school. He is highly protective of her and views Naoki's sudden change in behavior with deep suspicion.

A skilled and competitive member of the Tonan University tennis club. She has her eyes set on Naoki and sees Kotoko as an annoyance, though Naoki's new attitude throws her plans into disarray.

A clumsy but determined young woman who has harbored a long-standing crush on Naoki Irie. She joins the university tennis club solely to be closer to him, unaware of the new dynamic she's about to face.

A brilliant and wealthy young man who previously maintained a stoic facade. Now at university, he has decided to drop the act, revealing a mischievous and emotionally open side, particularly towards Kotoko.

Naoki's overly enthusiastic mother who has always championed Kotoko as her future daughter-in-law. She is thrilled by Naoki's new attitude and constantly meddles to encourage it.

Kotoko's loyal and loud childhood friend who has always loved her. He is shocked and suspicious of Naoki's sudden public affection.

Naoki's enthusiastic and meddlesome mother who desperately wants Kotoko as her daughter-in-law. She actively encourages and documents every romantic interaction between the two.

Kotoko's passionate and devoted childhood friend who is hopelessly in love with her. He constantly tries to win her heart and protect her from Naoki's antics.

Kotoko's loyal and boisterous friend who has always carried a torch for her. He struggles to understand Naoki's sudden, openly affectionate behavior towards Kotoko.

Naoki's eccentric and deeply romantic mother. She is thrilled by the changes in her son and enthusiastically schemes to push the couple even closer together.

A charismatic and somewhat arrogant coworker of Naoki's. He takes an interest in Kotoko, further complicating her attempt at a peaceful retreat.

Naoki's persistent cousin. She surprisingly shows up at the resort, determined to win Naoki's attention despite his marriage.

Naoki's cousin and the latest in a long line of his relentless admirers. She recently broke a cherished photo of Naoki and Kotoko, sparking the current conflict.

Naoki's cousin who recently moved into their house. Her entitled behavior and blatant pursuit of Naoki, culminating in breaking a cherished photo, is the final straw for Kotoko.

Naoki's cousin and a relentless admirer. Her recent actions, including breaking a precious photo of Kotoko and Naoki, pushed Kotoko past her breaking point.

Having endured years of unrequited love and the emotional toll of the Sahoko incident, Kotoko is seeking a peaceful life away from the chaos of Naoki's world.