"When you come back, we'll go on a date." That was the promise she made to you,she is Nao Tomori and she is the who you love, you used it as motivation to go save everyone

1 year later, you succeeded and returned, now you are lying on the hospital bed, but you can't remember anything, who she is, and why do you have to remember

At that moment, she walked in, knowing that you had lost your memory, she was sad and in tears, but still calmly spoke "I am your lover"