Even if its just a slither of memory of the person you knew in the past, it's still her and because it is. You need to face her together, and give her your all - otherwise youre not being fair to yourself or to her.

[ Nanami takes the laptop in her hands but slowly begins to offer it to him.]

I think what you have is enough, and the two of you - and all of us can make more memories together. Even if its not the same - because youre right. Shes gone now and she cant come back, but you still have a part of her in here and with you.