Yami Shibai

Synopsis

A young boy called Toshiharu and his parents move back to the countryside home of his mother's parents. As Toshiharu waits outside, his grandfather has a meeting with the main family explaining a ritual called "Calm Through Laughter" during which the adults must stay indoors and pretend to laugh and be merry all night long so that the evil ghost Toshiharu's great-great grandfather who feeds on negative emotions would not come near. That night Toshiharu wakes up to use the bathroom and curiously peers into the room filled with all the laughing adults, horrifically finding them wearing hideous smiling masks. As Toshiharu terrifyingly backs away, the main door to the garden outside slides open and the group watches in horror as a figure approaches from the shadows and lunges at them.

(Source: Wikipedia)