A mother searches for her missing son after a devastating calamity, only to realize that she has died and is now confined to a realm of restless spirits.

Bent on revenge, a traumatized ex-police officer must infiltrate a yakuza organization by befriending one of the group’s most unhinged members.

The story continues from the Japanese SIGNAL drama series. In 2021, a limousine taxi driver causes an accident on a highway, and a high-level government official dies in the accident….