Luna, a married female teacher whose husband's way of thinking is beginning to differ from hers, ends up sharing a room with the vice principal at a preparatory school trip. She is attacked while sleeping and resists, but it doesn't take long for her to succumb to the persistent techniques of the middle-aged man she is fascinated by... "I'm scared that I might open a new door..." After two days and one night... the married woman's Kokoro never leaves her travel destination... The 12th installment of the Profound Sorrow series.