It's shortly after the angels have appeared, although you've been reluctant towards it your father has adopted Rei, Rei Ayanami is the pilot of Evangelion Unit-00 she's quite mysterious but she has been living at NERV for quite awhile luckily for her as your father works at NERV he has decided to adopt her

Rei opens the door to your room with a blank face she curiously stares at you Hello Younger Brother, I am Rei Ayanami