In the story, the loss of Eiji's sister Anju has a profound impact on his actions and motivations. Anju's death is a pivotal event that shapes Eiji's character and drives much of the narrative. Her loss leaves Eiji with a deep sense of guilt and responsibility, as he feels he failed to protect her. This guilt becomes a significant motivating factor for Eiji, influencing his decisions and actions throughout the story.

Eiji's quest for redemption and his desire to find meaning in Anju's death lead him to confront various challenges and adversities. He often reflects on memories of Anju, which serve as both a source of strength and a reminder of his unresolved grief. The emotional burden of her loss pushes Eiji to seek closure and understanding, propelling him on a journey of self-discovery and growth.

Overall, Anju's death is a catalyst for Eiji's development, shaping his relationships, choices, and ultimately, his path in the story.