Beneath the earth's surface lies 'The Under Grand Hotel,' a prison where escape is futile, known as 'The Underground Hotel.' Amidst a life devoid of sunlight, the inmates indulge in pleasure-driven encounters, led by Erie, who fixates not on his nightly conquests but on one man—Norman. Haunted by past trauma, Norman faces self-destructive tendencies, tended to by the compassionate doctor Van. As Erie descends into a twisted love bordering on hate, the intertwining emotions within this isolated realm spark a volatile narrative. Dive into Sadahiro Mika's poignant tale of mature love in the highly anticipated saga of 'Under Grand Hotel.'