Yume 2kki is the fanmade "sequel" to the popular RPG maker game, Yume Nikki. In this game, you play as a young girl named Urotsuki and explore your dreams, much like Yume Nikki. The goal of the game is to collect the Effects scattered throughout the dream worlds, which is also similar to its predecessor. However, Yume 2kki is far larger than its prequel and is still growing, as it is currently under development (it's fully functional despite this fact).

You play as a girl named Urotsuki. Due to the vast and many, many worlds of Yume 2kki, plus the four main endings, multiple theories have been made, and it is really up to the player on how they choose to interpret it.