The Basement is the lowest level in the Main Building of Yeondu High School.
It was locked in Original version (2001).
However, The developer plans to release the area as a new Location in The School: Swan Song.
- In White Day: A Labyrinth Named School (2001) some screenshots and trailers showcase a basement/train area which is assumed to be the basement area although unconfirmed, this is also leftover in the map files.
- Early screenshots of the remake, The School: White Day from 2012 showcase a basement area (or a ruined corridor ) as well with what appears to be a ghost female student, this did not make it into the actual game, It's inclusion on the PC/PS4 Version is unknown.