Japanese Pink Eiga

A woman is trying to find out what happened to her missing younger sister, when she discovers a sinister online bulletin board on mass suicide that leads her to a small isolated village where desperate teenagers gather to find death.

A female detective of the Metropolitan Police Department who volunteered to undercover an unscrupulous company that communicates with the underworld in order to take the murder of her lover who was killed during the undercover operation. What is the unexpected ending that awaits her after a fierce battle with the "Axis of Evil"?