✔ The Compendium is divided into Main Quest/Sub Quest/Journal.
✔ For Main Quest and Sub Quest, a summarized narration of the journey becomes available after clearing.
✔ A Reward can be claimed upon the 1st clear. You must register all relevant plots in order to receive rewards for certain Sub Quests and Journal entries.
✔ Specific objects that were used and investigated during a stage can be registered into the Journal. Although it is not required to progress through the main story, the Journal contains stories that may reveal interesting stories about the residents of UNDECEMBER.