Hiroko Satô

Nao works part time at a convenience store, unaware of the malice of the ghosts and spirits surrounding her... She and a co-worker called Ryoko watch the world going mad around them, the birds going crazy, people getting enraged and going mad... and realise they have to do something

Akebono City is a peaceful community overflowing with humanity. Since there was a Power Spot that released magical power in the community, the people were distressed by the threat of the demon army Jamanga who are gathering Minus Energy from the frightened masses for a sinister purpose. (mydramalist.com)

Starts with a death in a locked room scenario. One of the investigating detectives cannot forget the case (or it follows him) for years. Have deliberately left this as vague to withhold the plot.

With stalker crimes on the rise in Tokyo, the Meiji Jingu Gaien police department decided to form an all-female Sex Crime Investigation Unit. As the first order of business, a member of the theft division is paired with a member of the community safety division. With no experience in brutal crimes, the pair is obviously unprepared for what they're going to face, so two more experienced detectives are soon dispatched to join them.