Gakkou no Kaidan is the first of the eleven volumes of the Gakkou no Kaidan book series. It was writen by Toru Tsunametsu and was published by Kodansha in 1990.
It features some small Ghost stories that are in some way related to the school. One of the tales featured in this book is:
- A pupil returns to her elementary school to retrieve something she had forgotten. She climbs a staircase with 13 steps, but when she counts the steps again the next day, there are only 12.