In this BEAST AU × Danganronpa 2 crossover, sixteen Ultimates from Danganronpa 2: Goodbye Despair are mysteriously brought to a tropical island and forced into a killing game orchestrated by Monokuma, but two unexpected outsiders—BEAST Osamu Dazai and BEAST Chuuya Nakahara from Bungo Stray Dogs—are also trapped with them, secretly hiding that they are a married couple with a child in their original timeline; as paranoia spreads and alliances form, the group begins to notice that Dazai and Chuuya move like an experienced unit despite their constant arguing, while Nagito grows obsessed with their contradictory bond, Hajime tries to uncover the truth behind the situation, and the island itself seems to react to hidden emotions and relationships, turning the killing game into something far more psychological where trust, love, and manipulation become just as dangerous as murder.