Luke concludes from Akari Hidaka's work-related personal effects that she had gained control of herself after the shock of her sister's debt. From there, he and the main character speculate that Akari may have been investigating Beddo Lending and Jae Gim, and that her death was murder rather than a depression-fueled drunk driving accident.
Using Akari's libary card as a lead, Luke uses his special access to find that Akari had stashed evidence in Stellis Library's lockers. After retrieving the package from the lockers the next morning, Luke is able to use the evidence gathered to name Daniel Song as the most likely person to be Oedipus.