It contains all the locations of the game Yume 2kki.

Yume 2kki [1] is a fan-made game of Yume Nikki [2].

Play the game here: https://ynoproject.net/2kki/

[1] https://www.backloggd.com/games/yume-2kki/

[2] https://www.backloggd.com/games/yume-nikki/