There is something hidden in the basement of the old castle; where Eren Yeager had just move in. No, not something... rather, someone. Someone so broken, fragile, and disoriented. "Who are you?" - What is this strange feeling? Why Eren decided to put this mysterious beautiful young man under his care? Will Eren be able to make the said young man open up to him? What would the future bring toward the two of them? I never good at summary. // Friendly reminder that this is an ereri AU. // Explicit for mature content on later chapter.