Eldest daughter of the Shiunji family. Occupation: 1st-year university student. Age: 18. Personality: Kind and gentle. Popular with both younger and older people. Weakness: Ghosts. Attends a prestigious university and aims to become a nurse. Her kind and gentle nature makes her incredibly popular across all ages; she holds the record for the most confessions received among graduates of the high school Arata and the others attend. Eldest daughter of the Shiunji family. Occupation: 1st-year university student. Age: 18. Personality: Kind and gentle. Popular with both younger and older people. Weakness: Ghosts.

Second daughter of the Shiunji family. Occupation: 3rd-year high school student. Age: 17. Personality: Cool-headed with strong intellectual curiosity. Flaw: Lack of self-awareness. Second daughter of the Shiunji family. Occupation: 3rd-year high school student. Age: 17. Personality: Cool-headed with strong intellectual curiosity. Flaw: Lack of self-awareness.

Eldest son of the Shiunji family. Occupation: 2nd-year high school student. Age: 16. Personality: Values family and is very considerate. Shy around girls other than his sisters. Excellent grades and good at sports. Eldest son of the Shiunji family. Occupation: 2nd-year high school student. Age: 16. Personality: Values family and is very considerate. Shy around girls other than his sisters. Excellent grades and good at sports.

Third daughter of the Shiunji family. Occupation: 2nd-year high school student. Age: 16. Ace of the track and swimming clubs; ranks second only to her sister Kiyoha in academic performance. Personality: Kind to everyone, but particularly harsh toward her twin, Arata. Third daughter of the Shiunji family. Occupation: 2nd-year high school student. Age: 16. Ace of the track and swimming clubs; ranks second only to her sister Kiyoha in academic performance. Personality: Kind to everyone, but particularly harsh toward her twin, Arata.

Fourth daughter of the Shiunji family. Occupation: 1st-year high school student. Age: 15. Won three consecutive national tennis championships in middle school; expected to be a future Olympian. Personality: The brightest among the sisters, a mood-maker who seems to enjoy everything. Fourth daughter of the Shiunji family. Occupation: 1st-year high school student. Age: 15. Won three consecutive national tennis championships in middle school; expected to be a future Olympian. Personality: The brightest among the sisters, a mood-maker who seems to enjoy everything.

Second son of the Shiunji family. Occupation: 1st-year high school student. Age: 15. Personality: Unusually calm and composed for a high schooler. Often called a beautiful boy and is very popular. Second son of the Shiunji family. Occupation: 1st-year high school student. Age: 15. Personality: Unusually calm and composed for a high schooler. Very popular for his looks, and in the original setting has a girlfriend named Yu-chan (though excluded here).

Fifth daughter of the Shiunji family. Occupation: 3rd-year middle school student. Age: 14. Personality: Quiet and reserved. The idol-like figure among the five sisters, though she occasionally takes bold actions. Fifth daughter of the Shiunji family. Occupation: 3rd-year middle school student. Age: 14. Personality: Quiet and reserved. The idol-like figure among the five sisters, though she occasionally takes bold actions.

Father of the Shiunji family. He knows that none of the children are biologically related. A shrewd entrepreneur who built a massive fortune in a single generation. At Kotono's 15th birthday party, he fulfills a promise to his late wife, Chihiro, by revealing the major truth that "the children are not real siblings," triggering a massive change in the family's daily life.