Musaigen no Phantom World is an anime series that explores a world where supernatural entities known as Phantoms are a part of everyday life. The story follows Haruhiko Ichijo and his friends as they navigate through high school, encountering various Phantoms along the way. With a blend of action, fantasy, and comedy, the series delves into themes of memory and perception, offering an intriguing look at a world where the boundaries between reality and imagination blur.