A 2nd-year student. A diligent honor student (ranked 2nd in his grade) who entered on a scholarship with tuition waived. He is a dry, logical thinker but can be indecisive and occasionally overreacts. Influenced by his adoptive parents, he is physically strong and skilled at general housework. He is bad with geckos. Originally born as the second son of a wealthy family, he was raised as a commoner due to a hospital mix-up.

A 2nd-year student. A former student of the private Orpheus Girls' Academy. Her hobbies include social media and cosplay, and she has a fair amount of fame as an influencer. When she posts selfies, she is beautiful enough to become a hot topic in the streets. She has a bright and competitive personality, but is somewhat poor at socializing, getting nervous and unable to speak well with people she meets for the first time. Her academic performance is not very good, but she is skilled at sports. Originally born as the eldest daughter of a delinquent family, she was raised as a young lady of a wealthy family due to a hospital mix-up.

A 2nd-year student. A talented girl who is top of her grade. She is popular among both boys and girls, but her true nature is that of a natural airhead. She is the successor to Meguro Myojin, a shrine that has continued since the Heian period. She has a very competitive personality and is always vying for the top spot with Nagi in periodic exams. She is well-versed in martial arts, holding a third-degree black belt in karate and also practicing kickboxing.

Nagi's younger adoptive sister and Erika's biological younger sister. A 3rd-year middle school student. She sometimes helps out at "Umino-tei," the restaurant run by her parents. She calls Nagi "Onii." She seems to have been clumsy by nature; while the taste isn't bad, the presentation of her cooking is poor, and her academic performance is also not very favorable. She has a personality where she always carries out what she has decided once.

The biological father of Erika and Sachi, and Nagi's adoptive father. A former delinquent. The owner of the restaurant "Umino-tei." His hobby is fishing. He is a man with a boisterous personality, carrying himself in flashy clothes and sunglasses, a remnant of his delinquent days. He is kind-hearted.

The biological mother of Erika and Sachi, and Nagi's adoptive mother. Like her husband, she is a former delinquent. The landlady of the restaurant "Umino-tei." Though she isn't aware of it herself, she is a youthful beauty who doesn't look like a mother of two. She and Yohei have a relationship where they are close enough to bicker constantly.

Nagi's biological father and Erika's adoptive father. Born into a poor family, he is now a wealthy man who runs a hotel business. He has an inscrutable personality, being elusive and aloof. He is a billionaire far removed from the common world, capable of providing a mansion with ease.

Nagi's biological mother and Erika's adoptive mother. Born into a wealthy family, she is currently a high-powered producer at a television station. She has a carefree personality that lacks a sense of delicacy.