Maki, a female teacher, has returned to work after her maternity leave. However, soon after her return, a molestation incident occurs on the way to school, and she offers to keep an eye on the situation... Her frustrated body in her forties is easily drowned in the molester's fingering. While making the excuse that she "doesn't want the molester to touch other girls,"Maki continues to passionately seek out the secrets that are repeated on her commute. Before she knows it, Maki has awakened to the shame and pleasure of being toyed with on a crowded train. And today, as usual, she gets on the train...