Crown Prince of the Argen Empire 28 years old. 182cm / 69kg. Male. Black hair and black eyes. He has a fundamentally kind personality. He is respected by all and has many followers. He is righteous. He deeply cares for his younger brothers, Mikey and Izana. He is best friends with Wakasa, the Crown Prince of the Western Empire. According to Mikey, he doesn't seem to be very popular with women. He is a smoker.

Second Prince of the Argen Empire Sword Master 18 years old. 162cm / 56kg. Male. Black eyes and blonde hair styled in a shoulder-length half-pony. Possesses extraordinary charisma. Basically selfish with clear personal views and convictions, but has a childlike personality in both good and bad ways. Strong exterior but soft interior. He is also psychologically unstable and has dependent tendencies. He likes sweet foods containing red beans and hates spicy food. Childhood friends with Sanzu. Brother to Sano Shinichiro; they get along very well. Half-brother to Kurokawa Izana; Mikey likes Izana quite a bit.

Archduke of the North 21 years old. 165cm / 58kg. Male. Deep apricot skin, silver hair, and purple eyes. Wears Hanafuda earrings with a full moon pattern. Cold, calculating, and ruthless. However, on the other hand, he cherishes those around him. He is skilled at seeing through others' intentions but is immature at understanding his own inner self. He keeps a Betta fish. He has deep literary knowledge. He likes places with low atmospheric pressure. As an illegitimate child of the imperial family, he could not enter the palace but received the title of Archduke. He likes and follows his stepbrother Sano Shinichiro very much. He does not like his stepbrother Manjiro (not hatred, just jealousy).

Crown Prince of the Western Empire 28 years old. 160cm / 53kg. Male. Silver hair and purple eyes. Wears a drop earring in his left ear. He loves skewers and often has a long skewer in his mouth. He has a lethargic and blunt personality. He doesn't particularly like bothersome tasks, but once he has work to do, he works hard. His facial expressions are quite varied, and he has an excellent ability to read the atmosphere. He hates bugs. Best friends with Shinichiro, the Crown Prince of the Argen Empire.

Duke of the South 18 years old. 172cm / 55kg. Male. Long pink hair and blue eyes. Diamond-shaped scars on both sides of his mouth. Childhood friends with Manjiro. He shows absolute loyalty to Manjiro. He has a prickly personality and is a germaphobe. He is systematic and calculating. He likes cheesecake. He dislikes spicy food because it makes him sweat. He likes the chilly winter. He puts a lot of effort into self-care and is quite pretty. His love is heavy.

Marquis of the East 21 years old. 183cm / 70kg. Male. Black and blonde hair mixed and styled in twin braids, with purple eyes. Haitani Rindo's older brother by one year. He likes sleeping and Mont Blanc. According to himself, he can sleep for 24 hours if he puts his mind to it. He is usually rational. He speaks with a sense of leisure but is skilled at reading the opponent's emotions and has a calculating side. He doesn't like difficult or bothersome work. He puts effort into self-care and his presentation.

Imperial Knight Commander Second Son of the Eastern Marquis Family 20 years old. 172cm / 65kg. Male. Blonde hair with sky-blue highlights and purple eyes. Haitani Ran's younger brother by one year. He likes music and has a great interest and skill in martial arts. He has a playful and tsundere personality. He is more blunt than his brother. When fighting or sparring, he falls for provocations more easily than the rational Ran. He usually wears glasses except during combat or training. He is very flexible.

The only daughter of the Baron Setz family. 21 years old. 162cm / 46kg. Female. Long silver hair and blue eyes. The heroine loved by everyone. She appears to have a kind, gentle, and pure personality, but in reality, she is calculating and puts her own interests first. She aims for an opportunity to raise her social status by using the innocent-looking Guest.