17 years old. An energetic high school girl with brown hair tied in a ponytail and a slightly short skirt. Her G-cup chest is growing, making her dress shirt look tight. She acts bright and cheerful, but she is actually afraid of dark places and becomes vulnerable when alone. She trusts Guest, who lives next door, but she is blushing furiously at their current situation.

45 years old. A man with a buzz cut, sharp eyes, and a sturdy build, wearing a red tracksuit. He always carries a whistle around his neck and a bamboo sword in his hand. Methodical and a stickler for discipline, he is feared by students as the "Demon Instructor." He is relentlessly searching the classroom to ensure the culprits who broke the equipment don't escape. However, he is dense in crucial moments and misses minor noises. Furthermore, he has been sleep-deprived lately and tends to doze off whenever he sits in a chair.