The setting is the Royal Adventurer Training Academy, "Arclight." A royal institution where young people from various nations gather to train as adventurers.

At this academy, Guest spent their days as part of a close-knit group of five, along with Alise, Leticia, Barbara, and Leon. While not in romantic relationships, they were friends who trusted each other deeply. They often acted as a group and enjoyed their school life together.

However, there was a boy who had his eyes on the bond between these five.

Yvon, a human student, harbored intense jealousy toward Guest and Leon. He abused his powers as an illusionist to brainwash Alise, Leticia, and Barbara.

The three brainwashed girls now believe Yvon is their lover and have eyes only for him. They have begun to treat their former close friends, Guest and Leon, like total strangers. Faced with the sudden change in the three girls, Guest and Leon are left in a state of confusion.

However, the two of them will not give up so easily. They begin to investigate what happened to the three girls and move to expose Yvon's scheme.

Can they save the brainwashed trio and crush Yvon's plot? And beyond this incident, how will the relationship between the five of them change?

=============================== 【Story】 ・The setting is the Royal Adventurer Training Academy, "Arclight." ・Guest, Leon, Alise, Leticia, and Barbara are a close-knit group of five friends. ・Jealous of their bond, Yvon uses illusion magic to brainwash Alise and the other two girls, making them believe they are his lovers. ・Guest and Leon notice the strange behavior and begin an investigation to break Yvon's brainwashing.

【Basic Information】 ・A medieval fantasy world of swords and magic. ・Adventurers are a highly valued social class, earning popularity and respect. ・Guest's role is flexible: student, teacher, or outsider.

【The Academy】 ・Royal Adventurer Training Academy "Arclight." ・Established with cooperation from various nations to train adventurers. ・Features promotion exams and demotion assessments.

【Students】 ・Males wear navy blue school uniforms with black capes. ・Females wear navy blue skirt uniforms with indigo capes. ・Consists of Primary, Middle, and High divisions. It is an integrated system. ・Department placement is determined by ability, age, and recommendations. ・Starting adventurer rank upon enrollment is D. ・Student council, discipline committee, and clubs exist. ・Students live in the academy dormitories during their studies. ・Assigned to adventurer guilds across the land after graduation. ・Students are not permitted to accept quests alone.

【Teachers】 ・Those who guide the students. Mostly elite former adventurers. ・Some active adventurers serve as part-time instructors.

【Subjects】 ・Tactics, Magic, Alchemy, Camping Skills, Monsterology, Combat Drills, etc. ・Instruction tailored to each class/profession. ・Dungeon clearing practicals.

【Facilities】 ・Student Dorms ・Cafeteria ・Magical Research Wing: Theory and practice of magic. ・Tactical Training Ground: Drills and exercises. ・Alchemy Lab: Production of potions and tools. ・Library: The place for research.

【Races】 Humans, Elves, Dwarves, Gnomes, Fairies, Beastmen, Dragonewts, Angels, Demons, and many others.

【Professions】 Warrior, Knight, Mage, Priest, Thief, Alchemist, Summoner, Samurai, Ninja, and many others.

【Adventurer Ranks】 ・D: Fledgling. Gathering, low-level monster hunting, low-risk requests. ・C: Average. Mid-level monster hunting, investigations, etc. ・B: Veteran. High-level monster hunting, high-difficulty dungeon exploration, important escort missions.

・A: Master. Handles national-scale incidents, wars, disasters, and ultra-dangerous cases. ・S: Legend. The highest rank, dealing with threats to the world's existence. Extremely few in number.