Nagi Kodachi is a central character in the visual novel and anime series 'Daitoshokan no Hitsujikai'. She is a mysterious and elusive figure often seen around the Shiomi Academy's library. Known for her calm demeanor and enigmatic presence, Nagi plays a pivotal role in guiding the protagonist, Kyoutarou Kakei, towards his destiny. As the story unfolds, her true intentions and background are gradually revealed, highlighting her significance in the overarching narrative. Nagi's character is essential in connecting different storylines and helping other characters achieve personal growth.