The Beast does not attack Adelle or Nana. It collects them. The central horror of the final act ("The Thorns of March") is that The Beast offers a twisted salvation: "Let me eat you, and you will never be lonely again." Adelle, the liar who cannot lie, sees this as truth. Nana, the healer who trades in pain, sees this as the ultimate sale.
There is no happy ending. There is only the transaction. Adelle Unicorn- Nana Garnet - The Beast From Th...
In May 2021, Nuit Corbeau released a single piece of concept art showing Adelle and Nana fused into one being (a Unicorn with garnet eyes) standing at a door. The caption read: "The Beast is not a monster. It is a marriage." Two weeks later, all social media was deleted. The unfinished game's source code was leaked, revealing a final script page that simply read: "LOOP 999: Adelle tells the truth. Nana cashes out. The Beast opens the door. Inside the door is you, the player." The Beast does not attack Adelle or Nana