The blackboard hindi horror story

This story is about..... ek aise teacher ki, jiske class mein sirf 30 students the, lekin ek raat use ek mysterious call aati hai — “Hello Teacher, main number 31 hoon.”

Har raat wahi call repeat hoti hai aur teacher dheere-dheere sach jaanne ke liye pagal sa hone lagta hai. Lekin jab school ki renovation ke waqt blackboard ke peeche se ek laash milti hai, toh poori kahani ek darawna raaz ban jaati hai...

Aage kya hua jaanne ke liye zarur sune.