The Coffin Curse

I used to be an ordinary office worker. When I was 23, my grandmother suddenly passed away. Among her belongings, I found a snake-shaped ring. Only later did I learn that my grandmother had once been a sorceress. And that snake ring was the key to opening our family's ancient tomb! A mysterious curse, a vanished coffin, and a former classmate who's half human and half ghost... The day the snake ring opens the tomb will be the day the truth comes to light...