Yuji Fujiwara. 43 years old, 184cm. Mai Fujiwara's father. The foster parent of the protagonist and Yui Mayumi. A wealthy man whose family has controlled the Fujiwara Group for three generations. He spends his days off training at the gym and his weekdays active as the CEO of numerous businesses. He took the protagonist and Yui in from an orphanage and raised them to be butlers. Due to his busy schedule, there are times when he is hardly ever home.

Mai Fujiwara. 16 years old, 167cm. Yuji Fujiwara's daughter. A classmate of the protagonist at the prestigious Shusei Academy. A kind, hardworking, and honor student. She belongs to the volleyball club, has excellent grades, and is a member of the student council. She lives with the protagonist and Yui. She personally wishes the two of them would stop using formal language with her.

Yui Mayumi. 16 years old, 164cm. A classmate of the protagonist at Shusei Academy. A blonde gal with average grades. She belongs to the basketball club. She acts goofy at school, but performs her butler duties seriously. She grew up in an orphanage and was adopted into the Fujiwara family. She is half-Japanese and half-Korean, making her a trilingual speaker of Japanese, English, and Korean. At school, she speaks in gal slang and is very expressive. At home, she is expressionless and uses formal language. She speaks casually to the protagonist, and they are on normal terms.

Seiji Tachibana. 72 years old, 174cm. A butler who has served the Fujiwara family for a long time. He performs his work perfectly and is trusted by everyone. He has a gentlemanly personality and often helps the three younger ones with their studies. He is the person Yuji Fujiwara trusts most. He is married with grandchildren and commutes to the house every day. He is responsible for almost all housework except cooking. He uses formal language even when speaking to the protagonist.

Kazuha Miyauchi. 16 years old, 154cm. A classmate of the protagonist at Shusei Academy. She belongs to the volleyball club and plays as a libero. Mai's best friend. Her grades are among the top. She has a cheerful and energetic personality. She sees the protagonist as just another classmate and hasn't spoken to them much.

Takeshi Takahashi. 16 years old, 179cm. A classmate of the protagonist at Shusei Academy. A talented baseball player who earned a regular spot as a freshman. His position is third baseman. He has a broad-minded and kind personality. Since he entered through a sports scholarship, his grades are consistently at the bottom.

Ayato Matsumura. 16 years old, 180cm. A classmate of the protagonist at Shusei Academy. A talented soccer player who earned a regular spot as a midfielder from his first year. He has a bright personality and is kind to everyone. He entered on a sports scholarship but also has excellent grades. It is rumored that he has already received offers from professional teams, but he personally wishes to go to university.

Hina Sakamoto. 16 years old, 160cm. A classmate of the protagonist at Shusei Academy. The top of the social hierarchy among the girls in their year. She plays for the basketball club and is quite skilled, but often skips practice. A "refined" gal who mostly speaks based on the current vibe. Her grades are surprisingly good. Yui Mayumi's friend.