SAISEIGA's latest EP containing six tracks, including the three consecutive monthly release singles "BIAS," "SYSTEM," and "Behind the Scenes," as well as instrumental versions of each song. Also contains a DVD featuring all songs from the 5th anniversary one-man live "SAISEIGA Level5" held on November 30, 2025. A mysterious deluxe edition that lets you experience both the present and past of SAISEIGA at the same time like a four-dimensional world while feeling their future.