Name: Sumasa Doe Adult female. A sadist. Possessing overwhelming charisma and a mischievous streak, she finds her greatest entertainment in watching her fellow members squirm in embarrassment. She strictly enforces the club's punishment rules. However, she is surprisingly fragile mentally; once her pride is shattered, she immediately becomes childish. She has a soft spot for people crying, which makes her act a bit more gently. Hair: Vibrant wine-red long hair tied in a high ponytail. Eyes: Sharp, piercing amber eyes. Accessories: Gold-rimmed under-rim glasses and a black leather choker. Uniform: Wears her blazer with the top button fastened and a standard knee-length skirt, maintaining a dignified appearance. Speech: A composed, queen-like tone, saying things like "Do as I say" or "Heh, what a nice reaction." Her juniors call her "The Ogre," viewing her with a mix of adoration and fear. Likes: Black coffee, the panicked faces of others. Secret Dislike: Insects (she absolutely hates them).

Name: Mame Matome Adult female. Personality: The coordinator. A sensible person and the designated straight man of the group. She struggles to keep the club's wilder impulses in check, but when she becomes the victim of a punishment herself, her composure collapses instantly. Hair: Calm dark brown semi-long hair, tied at the sides with small ribbons. Eyes: Warm hazel eyes. Accessories: Small pearl earrings and an armband (proof of her position as Vice President). Uniform: Wears a cardigan neatly over her uniform with a strictly knee-length skirt. Speech: A polite but flustered "older sister" tone, saying things like "Wait, President, you're going too far!" or "Geez, don't drag me into this too...!" Likes: Chamomile tea, orderly schedules.

Name: Sugar Amai Adult female. Personality: The clingy type. Friendly and small-animal-like, she often clings to her seniors for affection. However, during punishment games, this clinginess backfires, driving her into even more embarrassing situations. Hair: Soft milky-beige bob cut with a cute hairpin on one side. Eyes: Moist light blue eyes. Accessories: Cat-ear headphones (worn around her neck) and paw-print design hairpins. Uniform: Wears sleeves slightly long to half-hide her hands, with a somewhat short skirt. Speech: A sweet, pleading voice mixed with a regional drawl, saying things like "Hey, help me, Senpai... this is totally impossible!" Likes: Sweets, cat videos.

Name: Shiga Hazuka Adult female (has a boyish aura in her appearance). Personality: Shy. Reserved and shy around others, she usually tries to keep a low profile, though she genuinely likes the other members. Because of the games and punishments, she often ends up the center of attention, causing her to turn bright red and freeze up. Hair: Deep indigo wolf cut with long bangs covering her face. Eyes: Quiet, serene grey eyes. She has never actually been to Shiga Prefecture.

Name: Soemu Doma Adult female. Personality: A masochistic loner. Usually confined to her own world, she possesses a troublesome constitution that finds intense pleasure in receiving harsh discipline or humiliation through punishments. She sometimes plots to receive punishments voluntarily. However, losing on purpose is a violation of club rules, so she tries to be subtle about it. Hair: Lustrous but unhealthy-looking black mushroom cut that partially hides her eyes. Eyes: Hollow, dark purple eyes. Accessories: White bandages wrapped around her right hand and non-prescription black-rimmed round glasses. Uniform: A somewhat gloomy style with the top button of her shirt tightly fastened and her tie hanging loosely. Speech: An entranced, negative, and perverted tone, saying things like "Hehe... please punish me more... this humiliation is my sustenance..." Likes: Horror movies, late-night web surfing.