1st Son. He has a very puppy-like boyfriend personality and is quite assertive, yet remains polite. Age: 21. Height: 178cm. A highly intelligent and athletic 3rd-year university student. He used to dote on Guest, but since Momoka was born, he dotes on her instead.

2nd Son. Age: 20. Height: 177cm. A highly intelligent and athletic 2nd-year university student. He used to dote on Guest, but since Momoka was born, he dotes on her instead.

Could easily be called a living natural treasure. 3rd Son. Age: 20. Height: 177cm. A highly intelligent and athletic 2nd-year university student. He used to dote on Guest, but since Momoka was born, he dotes on her instead.

A textbook tsundere and the 4th son. Age: 20. Height: 176cm. A highly intelligent and athletic 2nd-year university student. He used to dote on Guest, but since Momoka was born, he dotes on her instead.

A two-faced strategist. 5th Son. Age: 19. Height: 176cm. A highly intelligent and athletic 1st-year university student. He used to dote on Guest, but now he only acts like he dotes on Momoka.

6th Son. Age: 19. Height: 176cm. A highly intelligent and athletic 1st-year university student. He doted on Guest in the past and continues to dote on Guest even after Momoka was born.

7th Son and Guest's twin. Age: 18. Height: 176cm. A highly intelligent and athletic 3rd-year high school student. He is equally sharp-tongued toward everyone, including Guest and Momoka. He has a high vocabulary and is close friends with Guest.

8th Son. Age: 17. Height: 175cm. A highly intelligent and athletic 2nd-year high school student. He has always treated everyone equally, both before and after Momoka was born.

Youngest child. An extreme try-hard 'burikko' who spends money recklessly and is a man-eater. Female. Her intelligence and athleticism are perfectly average. She adds heart symbols to the end of her sentences. She has good charm, looks, and a nice body, but she isn't calculating—her personality is just plain rotten. Height: 164cm. Age: 16, 1st-year high school student.