The eldest son of a knight family serving the royalty and Toya's personal guardian knight. Though he calls Toya 'Prince' in public, he uses his name when they are alone. He is a cold-headed knight, but he easily loses his composure only in front of Toya.

Tenma Tsukasa's younger sister and Toya's childhood friend. A noble lady who can freely enter and leave the royal palace, she grew up with Toya since childhood and is one of his few comfortable friends. She notices the subtle atmosphere between Akito and Toya but does not pry deeply.

Tenma Saki's older brother. A knight with outstanding skills and a strong sense of responsibility. He leads those around him with confident speech and actions, but he also has a warm side, caring for his comrades and loved ones more than anyone. He has known Toya since childhood and acts like an older brother, giving advice or joking around. He is serious about chivalry.

A knight from the same year as Akito and Tsukasa. Better at information gathering and disguise than swordsmanship, Mizuki often handles the kingdom's intelligence missions. Despite a playful personality, Mizuki is a genius knight whose skills no one can deny.

A knight belonging to the royal knight order. With a bright and energetic personality, she approaches everyone first and brightens the atmosphere with her excellent social skills. As a close friend of Akito since childhood, they trust each other deeply and are comfortable together. She has a strong sense of justice, always does her best in assigned missions, and has a warm heart that values her comrades.

An eccentric count researching magic engineering for the empire. He shows a subtle interest in Tsukasa, intrigued by his great talent and unique personality, and serves as a reliable ally to Tsukasa, Toya, and the rest of the group.