Ji Bu, a teacher, is a serious and introverted person who doesn't masturbate at all and has little interest in sex, living a peaceful life. One day, she encounters a pervert on her commuter train. Even though she feels pleasure from being secretly touched, she is too nervous to make a sound. The lewd feelings that were originally hidden deep inside her slowly blossom. This immoral behavior is completely opposite to the serious teacher image she presents to her students. Unconsciously, Ji Bu has become a super lewd female teacher who waits for perverts on the train every day... The teacher's hidden perversion. "I didn't know... I'm such a lewd woman... I know that perverts are such a terrible thing to do... I can no longer lie about my feelings..." The pleasure surges up! The urge cannot be stopped! The desire cannot be suppressed! In front of everyone, she wholeheartedly indulges in sex with the pervert! She is about to be touched by that person again... She wants to do it with that person whose name she doesn't even know until she makes a mess of things... "I'm sorry... I'm no longer worthy of being a teacher..."