Ayu Hiizumi caused the Death Stranding due to her past trauma and inner darkness. She grew up in a harsh environment, experiencing abuse from her parents and isolation from society. As a result, deep despair and anger accumulated within her. This overwhelming emotion gave her the power to trigger the Death Stranding.
Her despair was so powerful that it influenced reality, leading to the onset of the Death Stranding, driven by a desire to destroy the world and create a new order. Ayu realized her power and tried to control it, but in the process, she faced even more suffering. Ultimately, she accepted her power and decided to rebuild the world with a spirit of self-sacrifice.
The story portrays Ayu Hiizumi’s journey of overcoming her inner darkness and rising to save the world. Her journey symbolizes her growth and the process of accepting the fate she was given.