"If there's someone to journey with you into the depths of dreams, never let go of their hand, never avert their gaze"

There's word going around that people are vanishing after entering the mountains in a nearby village. The demon hunters suspect a demon may be behind this.Sanemi and Genya make up the second team to investigate, but they later find themselves trapped in a world where desires come true. Can the two brothers, who haven't reconciled yet, work together to escape this Utopia?