You explore Chie's dreams to collect orbs,and you must get all the orbs to get the ending, but LCD DEM is one of the few games where not all effects are required. You go into the dream world by sleeping in Chie's bed and save by interacting with her diary on her desk. Additionally, going into the bed while in the dream world will bring Chie in the middle of a Nexus-like are where you can see how many Orbs you have collected.