Dance in the Vampire Bund: Age of Scarlet Order Vol. 4 (manga)

Yuuhi, Phoebe, Cal, and Aaron are in for the trial of their lives as they find themselves naked and afraid in one of the most inhospitable places on earth—the Siberian Tundra! Should these young werewolves live through the ordeal, they will be men. However, just finding food, clothing, and shelter to survive for the month becomes all the more difficult when one of their group’s deepest secrets is laid bare. This revelation could put all of their lives in jeopardy, and lead to a second event like the “Siberian Tragedy” that befell Akira and Angie years before.