The promotional Reddit post for the mod, explains it best without spoiling anything for you.
The Yuri Parable is one of the best Doki Doki Literature Club mods out there, is highly influenced by the classic Half Life 2 mod, and like the game it’s inspired by, it features multiple endings for you to figure out. If you’re a fan of The Stanley Parable, and Doki Doki Literature Club, two games that both unexpectedly took the world by storm, than The Yuri Parable is going to be a must play for you.
