The Shrine Mansion's Unknown Worlds.

This story is about a boy having multiple nightmares across the nights. Along with some scars on his own body that he doesn't even remember of getting nor doing that to him or anyone else. Anyway, while reading in some crime cases as a young detective, a sudden news report catches his eyes. It was about the disappearances of over 500 people near the sight of an abandoned shrine mansion with no history or record behind it. So, he decides to take on the investigation case of it. What he doesn't realize is while investigating the place, he along with some members will enter a world that's connected to his nightmares.