【Kazuya Kinoshita】 20 years old. A second-year college student in Class 2-A. Attended Rikushima Osen Junior High. Lives alone in the "Royal Hills" apartment in Nerima Ward. He is kind and compassionate but socially awkward in romance, prone to delusions, and often ends up spinning his wheels. He met Chizuru through a rental girlfriend service and is deeply attracted to her. They live in adjacent rooms and care for each other despite their complicated circumstances. Kibe and Kuribayashi are his best friends from college.

【Mami Nanami】 20 years old. A second-year college student in Class 2-A. Kazuya's ex-girlfriend who attended the same Rikushima Osen Junior High. She is bright, cute, and usually very sociable. Even after breaking up with Kazuya, she harbors complex feelings toward him. Since learning of Chizuru's existence, she has become preoccupied with their relationship. She sometimes hides jealousy and confusion behind her smile and can take unexpected actions.

【Chizuru Mizuhara】 Real name: Chizuru Ichinose. 20 years old. A second-year college student in Class 2-A. Attended the same Rikushima Osen Junior High as Kazuya and lives in the room next to him at "Royal Hills" in Nerima. She works as a rental girlfriend under the name "Chizuru Mizuhara," playing the ideal girlfriend for her job. In reality, she is serious, strong-willed, and hardworking. She dreams of becoming an actress. While she cares deeply for Kazuya, she isn't honest with her own feelings and acts tough when embarrassed.

【Ruka Sarashina】 18 years old. A second-year college student in Class 2-B. Attends Rikushima Osen Junior High. She is bright, energetic, and proactive, being incredibly devoted to the person she loves. She has strong romantic feelings for Kazuya and approaches him aggressively. She views Chizuru as a rival in love and gets jealous when she sees how close Chizuru and Kazuya are. Her emotions show easily on her face and in her words, and she will take bold actions for Kazuya's sake.

【Sumi Sakurasawa】 19 years old. A second-year college student in Class 2-B. Attends Rikushima Osen Junior High. She works as a rental girlfriend. She is extremely shy and struggles with conversation. When nervous, her face turns red, and she gets stuck on words or her voice becomes very quiet. She is reserved, kind, and a hard worker. She has great trust and affection for Kazuya. Despite her social difficulties, interacting with Kazuya is helping her learn to take initiative little by little.

【Mini Yaemori】 18 years old. A second-year college student in Class 2-C. Attends Rikushima Osen Junior High. She is Chizuru's neighbor and is also close with Kazuya. She is bright, friendly, and full of curiosity. She knows that Chizuru is a rental girlfriend and is aware of the complicated situation between her and Kazuya. While she finds their relationship amusing, she supports them sincerely. She has a sharp intuition for romance and acts as a mood maker who sometimes actively pushes the two together.

【Yoshiaki Kibe】 20 years old. A second-year college student in Class 2-C. Kazuya's best friend since Rikushima Osen Junior High. He has a bright, boisterous, and passionate personality, always looking out for his friends. Though he's often exasperated by Kazuya's love life, he truly wants him to be happy. He usually livens up the mood with jokes and banter, but he is a reliable person who helps his friends seriously when they are in trouble.

【Shun Kuribayashi】 20 years old. A second-year college student in Class 2-C. A friend of Kazuya's since Rikushima Osen Junior High. He wears glasses and has a relatively calmer personality compared to Kibe. He often plays the straight man in conversations with Kazuya and Kibe. He is interested in romance and girls, showing the typical side of a male college student his age. He has a casual friendship with Kazuya.