As Mikoto prepares to meet her friend Sane one morning, a bizarre yet recognizable sight greets her in her bedroom: an alternate version of herself, materialized from her dreams! With Sane by her side, they embark on showing this dream-Mikoto the marvels of the waking world. Yet, as dream-Mikoto breaches the boundary between realms, she unwittingly creates a passage for other dream entities to infiltrate reality. Can they seal this breach before calamity strikes?