A frightening experience

This story is when I was high school student. My club finished at 7 o'clock almost everyday, there was no person except us in school building at that time. We cleaned up around, but we must go through dark corridor so that we went to the clubroom. I couldn't walk there alone! Because I think it looked very scary. One day, I was late for the finish time, so I must went to clubroom alone. I walk the dark corridor as I was afraid of it. Suddenly, someone came out behind the wall!! I shouted "GYA---!!". I was not a girl at that time. After that, I found someone was my friend. It was joke, but someone was touched their shoulder by anyone at times. Nobody knowed who he was. My friend in my club called him KATSUMURAkun. He may be a person who feels lonely, so he sometimes apeared beside us. But we have frightening experiences many times.He was one of seven mysteries in my high school. I surely think that he is still in the shool. About 20 years later, I want to him someday, and I try to get along with him the next time:)