At 7:12 AM, on Track 2, Car 8, at the 4th door. I've been repeatedly harassed by a man I don't know his occupation or age. Even though I know as an educator, I'm unfit to stand on the podium, I still board that train today... Saika, who lived as a kind and ordinary teacher, had been harassed on her daily commute train one day. From then on, her desire to be touched by that harassment grew. The pleasure that increases with the unknown touch, the tension of not being able to speak even if she feels it, the immoral act that contrasts with her virtuous life as a teacher - little by little, Saika's virtue wavers, and she transforms into an immoral female teacher who waits for harassment on her daily commute train.