In Sekai Oni, we follow the tale of a young girl named Shinonome Azuma. Orphaned and taken in by her uncle's family, Azuma faces severe mistreatment, leading to her descent into mental instability and the peculiar Alice in Mirrorland syndrome. This condition causes her to witness illusions in mirrors, water, and glass. The line between reality and fantasy blurs as these visions begin to impact the physical world, unveiling a mysterious realm beyond the looking glass. Prepare to step into a twisted Wonderland where mirrors reflect more than just your image.