Complete the quest of Jiyon Shinaga. You can unlock too Less Tall lady quest
I have completed the task of retrieving the book for Sunaga, but I still cannot enter the cafeteria room.
??? Cafetaria in toilet, beside manequin in jackhallway 1, wdym???
The place where you find the book is Cafeteria room.
you already did, you climbed through the vent to the cafeteria room.
