I've been looking for someone to punish me...! A traditional club that exists at a girls' school. The name behind it is... Punishment Club. Mio, a girl who indulges in masturbation alone in a club room where no other club members are present, seeks stimulation. One day, she discovers a sadistic talent in her transfer student, Ai... The harsh punishments he begs for and receives every day. Ai gradually awakens to the pleasure of her torture.