It was a apathy boys' school.

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Sasagaoka Gakuen is located in Mito City, Ibaraki Prefecture.
This is a boys' school that was established more than 100 years ago.
It is famous as a prestigious and prestigious school, but there is a rumor that there was a secret facility of the Japanese Army during World War II.
And there is also a rumor about a dubious urban legend.
The underground of this school is said to contain hidden gold hidden by the Japanese Army.
Also, there is no end to the missing persons. The memory of the sudden disappearance of four students of the History Department five years ago is still vivid.
The first year students of the History Department accidentally got a notebook titled "The Search for the Narrow Room" written by the director of the History Department.
They enter the hidden underground of the school to find out the secret of the narrow room.
They do not know that it is the beginning of the horrors that raise hair.