Usagi is an English Yume Nikki fangame. In this game, the player takes control over a girl named Umiko as she explores her dreams. Once in the dream world, Umiko can visit numerous surreal worlds, find effects that change her appearance (and give her new abilities) and collect Mementos, which are needed in order to complete the game. While exploring the dream world, the player is encouraged to interpret the different events, locations and NPCs he/she encounters to uncover Umikos backstory.