He spends a night in the bathroom, but not engaging. He notes the temperature drop, the faint smell of running water, the sound of a skipping rope at 3 AM. He does not knock.
As the series progresses, Hanako and Nijima find themselves entangled in a web of supernatural events, involving vengeful spirits, curses, and mysterious powers. Hanako, it turns out, has a special gift - she can communicate with the spirits of the dead, and she uses this ability to help those in need. Toilet no Hanakosan vs Kukkyou Taimashi