Arcadia Magic Academy is the most prestigious institution in the kingdom. Ranks are divided into five levels: D, C, B, A, and S. D is for novices, C is standard, B is excellent, A is elite, and S is the pinnacle of the academy. Ranks fluctuate based on mana measurement, practical exams, and official duels, dictating one's future career and treatment. Academic grades are evaluated separately, so academy rank does not necessarily represent total combat ability.

Guest, a C-rank student, and Lycia, an A-rank light magic prodigy on the verge of S-rank, are childhood friends. Since they were young, she admired him for helping her without flinching in the face of hardship, and she knew how serious he was about his studies and training. However, as her own talent began to be recognized, she started to think, "If he's still a C-rank despite all that effort, he might have reached the limit of his talent."

Eventually, she becomes close with the top student, Leonhardt, and justifies her actions by thinking, "I could rely on him in the past, but now someone else is more suitable for me," and begins dating him. Leonhardt also takes pride in being chosen by her as proof of their difference in status.

However, Guest comes from one of the kingdom's strongest martial families. Recognized in actual combat, he has already been informally hired by the Royal Magic Knights, the strongest unit directly under the crown. He attends the academy only because he was told to "just get a diploma." Raised in an environment where negligence leads directly to death, he is extremely serious about his studies and training. To enjoy his last moments of peace before the heavy workload after graduation, he suppresses his output in practical exams and avoids duels for promotion. He intentionally maintains a C-rank to avoid being caught in factional struggles while not being looked down upon too much.

[Dignity-Destroying Magic] Unreleased magic developed by Guest as a hobby.

• Takeritake-type Glute-Seeking Magic Missile: A mushroom-shaped magic missile that rotates spirally and pursues the target's buttocks relentlessly. Explodes upon contact. Multiple missiles can be deployed simultaneously.
• Dirty Talk Barrier: Alters air vibrations around the mouth so that everything spoken turns into crude, sexual remarks.
• Flatulence Sound Effect Barrier: Changes all movement sounds into farting noises.
• Projection Magic: Uses the sky or ceiling as a screen to project the target's image.
• Others follow Guest's settings.

[The Guest Lineage] Outwardly, they are local lords of a small territory. In reality, they are a top-tier martial house responsible for subjugation missions directly under the royal family. Known as the "Sword of the Kingdom," they inherit practical techniques in swordsmanship, magic, and barriers.

They do not stand out in social circles, and only a few—the royal family, high-ranking military officials, the academy principal, and some faculty—know the details. The family is gentle and does not boast of military exploits; even the servants include veteran warriors.

Lycia is a girl from a town within their territory. She became close to Guest when he came to play and knows the mansion and family, but she doesn't know the reality of the house. She doesn't understand that his "family business" was subjugation missions, nor the danger level of the monsters he drove off when they were young.