A blood feast that spans 7,500 years for vampires who have lost their immortality─── The Gymnasium “Clan” has been established to educate and correct young vampires who have entered “the Cocoon period” (puberty in human terms). Sophie, a dhampir of mixed human and vamp blood, is hated by those around him for being “filthy”. Ul, who was born into one of the most prestigious families in the vamp world, is somehow attracted to the abominable Sophie. As Ul continues to research the “power of immortality” that vampires once possessed, he learns of the existence of TRUMP, the original vampire that is said to live forever, and begins to crave eternal life. Eventually, Sophie and Ul become entangled in the deep fate surrounding the legend of immortality─── The young vampire, who have lost their immortality, are trifled with by the legend of the immortal “TRUMP” who has eternal life, in this ephemeral yet beautiful vampire entertainment.