Psychic Horror ADV Complete Series Shiin x NG x Shinigami: Shibito Magire

Shiin
The game’s story is based on a rumor that alleges that in Tokyo’s “H” district those who receive a death seal will die. There have been cases in which people who had a mysterious mark appear suddenly on their body have died without an explanation, causing the spreading of the rumor. Some think that the seal is caused by encountering a ghost or being affected by a curse.

Those who have the death seals are suddenly called to a certain villa. The protagonist is one of them, and is greeted by a beautiful talking doll that welcomes him to “Kujou Mansion.” The doll warns him that he will die if he doesn’t manage to do something about it.

NG
You have been Marked...

A strange rumor is spreading through the shadows of Tokyo's H City: a mysterious disfigurement, like a grotesque birthmark, has been appearing on the bodies of certain individuals. Anyone who receives the Mark will rapidly die of unknown, horrifying causes.

Deprived of your memories, you arrive at a mansion rumored to protect the bearers of the Mark. As the doors swing open, the countdown to death has already begun...

Shinigami: Shibito Magire
In the suburbs of Tokyo's H City is a private institution called "Konoehara Academy," which was established over 100 years ago. There were rumors that every 10 years, the dead would creep into the academy and spread a curse.

Around the end of summer, some students of the academy died an inexplicable death in the academy garden...

While a police investigation was unable to confirm the nature of the incident, many rumors spread among the students regarding their tragic death, such as "it was the work of the dead" and "they were summoned by spirits."

In order to regain a sense of composure within the academy, the chairman requested an investigation from the Kujou house, which has been involved in rituals since ancient times.

A strange and sullen middle-aged man able to "examine" the supernatural, the head of the Kujou house begins an undercover investigation as a temporary teacher in order to determine the truth of the rumors.

And to experience the terrible curse from the dead that has crept into the academy...